Develop Bugs

Changing CSC to U1 for USA's Samsung Pay?

I'm trying to get the USA version of Samung Pay working on my SM-G9600 (International Unlocked Snapdragon S9). Unfortunately, my active CSC is currently set to TTT (Trinidad/Tobago... not sure how, I flashed a CHO firmware, haha), so even when I have my Samsung Account and AT&T SIM card inserted, opening S-Pay just gives me an error, "Unable to connect to Samsung Pay temporarily. Try again later."
To remedy this, I think my best option would be to flash a new CSC from a different region? However, I don't really understand how Samsung's CSC system works; I've tried researching it, but I haven't found anywhere that really explains in detail what CSC actually does, single-CSC vs multi-CSC, etc... Can anyone give me a summary of all the major parts? Or at least point me towards a good resource to learn about it?
However, I have more practical, direct questions:
Could I flash my G9600 with just the CSC (or better, HOME_CSC) of a USA Snapdragon variant, like the U1? Or would that break things, since it's a different model number? Would that be likely to get me a working Samsung Pay?
I guess I should flash the CSC (or better, HOME_CSC) of a different region that also carries the G9600? Of the regions that carry the G9600 (China/Latin America), I believe the only countries that support Samsung Pay are Brazil, Mexico, and Puerto Rico (and Hong Kong, but only with Hong Kong banks? I think.) If using a CSC from the US is a bad idea, which of these would be best? I'm guessing Puerto Rico, since it's most closely related to the USA, but the only PCT firmware on Updato currently has the v1 bootloader, but I'm already on the v2 bootloader (2ARE6), so I don't think I can use it.
I would guess that the next best option would be Mexico, since it's pretty close to the USA, and I see a firmware with the v2 bootloader for it on Updato. However, I'm not familiar with that region code. Is MXO a specific carrier in Mexico? Or is it the carrier unlocked firmware, like U1 is in the US?

MXO is unbranded bro and working samsung pay.
I wanted flash a specific carrier csc but I couldn't set TCE always appers CHC.

nelsyv said:
I'm trying to get the USA version of Samung Pay working on my SM-G9600 (International Unlocked Snapdragon S9). Unfortunately, my active CSC is currently set to TTT (Trinidad/Tobago... not sure how, I flashed a CHO firmware, haha), so even when I have my Samsung Account and AT&T SIM card inserted, opening S-Pay just gives me an error, "Unable to connect to Samsung Pay temporarily. Try again later."
To remedy this, I think my best option would be to flash a new CSC from a different region? However, I don't really understand how Samsung's CSC system works; I've tried researching it, but I haven't found anywhere that really explains in detail what CSC actually does, single-CSC vs multi-CSC, etc... Can anyone give me a summary of all the major parts? Or at least point me towards a good resource to learn about it?
However, I have more practical, direct questions:
Could I flash my G9600 with just the CSC (or better, HOME_CSC) of a USA Snapdragon variant, like the U1? Or would that break things, since it's a different model number? Would that be likely to get me a working Samsung Pay?
I guess I should flash the CSC (or better, HOME_CSC) of a different region that also carries the G9600? Of the regions that carry the G9600 (China/Latin America), I believe the only countries that support Samsung Pay are Brazil, Mexico, and Puerto Rico (and Hong Kong, but only with Hong Kong banks? I think.) If using a CSC from the US is a bad idea, which of these would be best? I'm guessing Puerto Rico, since it's most closely related to the USA, but the only PCT firmware on Updato currently has the v1 bootloader, but I'm already on the v2 bootloader (2ARE6), so I don't think I can use it.
I would guess that the next best option would be Mexico, since it's pretty close to the USA, and I see a firmware with the v2 bootloader for it on Updato. However, I'm not familiar with that region code. Is MXO a specific carrier in Mexico? Or is it the carrier unlocked firmware, like U1 is in the US?
Click to expand...
Click to collapse
Did you end up flashing the MXO ROM? If you did, do you still have dual SIM capability after that? Thanks!

sentron said:
Did you end up flashing the MXO ROM? If you did, do you still have dual SIM capability after that? Thanks!
Click to expand...
Click to collapse
Yes! Dual SIM is not affected by which SM-G9600 firmware you flash. The thing to be wary about would be if you tried to flash a different model's firmware to it (e.g: G960U), since there is no Dual SIM among the U models. Although if I had to guess, the Dual SIM settings would probably still work fine (assuming the U firmware didn't brick it otherwise).

Have you found a fix for this problem, are you able to use samsung pay here in US?
Did you change the csc only or flash the whole frameware?
Thank you in advance.

I'm also wondering about flashing just the CSC on a dual SIM device. I have a Note 9 dual SIM that will not get Volte, so I was thinking about flashing the U1 CSC to see if it would fix it. Does anyone have any advice?

You guys are so good at this compared to me. I felt like a noob ?.
I posted a question a few days back but not getting a meaningful answer. The goal is to do minimal changes but get Samsung Pay working.
https://forum.xda-developers.com/galaxy-s9/help/sm9600-want-to-flash-firmware-samsung-t3837428

Anyone found a fix for Samsung pay?

Flashing S20+ SM-G9860

I recently obtained a Samsung S20+ SM-G9860. However, I am in the US and am intending to flash the AT&T firmware for the SM-G986U. When I try to do this, I get a secure check fail on the PIT file due to the differing model. Is there a way to circumvent this? The two models have identical hardware from what I can see.
Is it possible to do this, and what is the process for doing this if it is indeed possible?

You cannot flash a rom built for a snapdragon chipset on a phone with a exynos chipset
Be thankful there is that safety check built in. Lol
Sent from my SM-G988U1 using Tapatalk

tdevaughn said:
You cannot flash a rom built for a snapdragon chipset on a phone with a exynos chipset
Be thankful there is that safety check built in. Lol
Sent from my SM-G988U1 using Tapatalk
Click to expand...
Click to collapse
It's not Exynos, it's also a Snapdragon.

Oh, the Brazil variant. Still dont think it will work. They might be dual sim
Sent from my SM-G988U1 using Tapatalk

tdevaughn said:
Oh, the Brazil variant. Still dont think it will work. They might be dual sim
Sent from my SM-G988U1 using Tapatalk
Click to expand...
Click to collapse
It's the Hong Kong variant. It does appear to be a dual SIM, however.

YES PLEASE!! I need to change my S20+ Snapdragon SM-G986U firmware to SM-9860 too!!!
Sanctanimus said:
I recently obtained a Samsung S20+ SM-G9860. However, I am in the US and am intending to flash the AT&T firmware for the SM-G986U. When I try to do this, I get a secure check fail on the PIT file due to the differing model. Is there a way to circumvent this? The two models have identical hardware from what I can see.
Is it possible to do this, and what is the process for doing this if it is indeed possible?
Click to expand...
Click to collapse
YES PLEASE!! I need to change my S20+ Snapdragon SM-G986U firmware to Hong Kong SM-9860 firmware too! Any help please Samsung S20+ Snapdragons masters?!! :crying:

Sanctanimus said:
I recently obtained a Samsung S20+ SM-G9860. However, I am in the US and am intending to flash the AT&T firmware for the SM-G986U. When I try to do this, I get a secure check fail on the PIT file due to the differing model. Is there a way to circumvent this? The two models have identical hardware from what I can see.
Is it possible to do this, and what is the process for doing this if it is indeed possible?
Click to expand...
Click to collapse
The hardware isn't identical, SM-G986U is a Single SIM Device, your's is a Dual SIM.. TGY is the CSC in your device and even if you could flash SM-G986U Firmware the CSC would not change, it will still be TGY. If you're looking to get full AT&T call functionality on your device it's not possible as the CSC doesn't support AT&T compatibility. Firmware is CSC specific as well.

varcor said:
The hardware isn't identical, SM-G986U is a Single SIM Device, your's is a Dual SIM.. TGY is the CSC in your device and even if you could flash SM-G986U Firmware the CSC would not change, it will still be TGY. If you're looking to get full AT&T call functionality on your device it's not possible as the CSC doesn't support AT&T compatibility. Firmware is CSC specific as well.
Click to expand...
Click to collapse
But mine has two IMEI numbers though 1 for physical and another for esim, HOWEVER the esim option to add another QR code for another network is not visible. Its like the device is locked for VERIZON esim use only.
Oh well, guess gotta wait for another few month for newer updates to be able to use another network esim or firmware flashing that can enable this option soon...

x88888x said:
But mine has two IMEI numbers though 1 for physical and another for esim, HOWEVER the esim option to add another QR code for another network is not visible. Its like the device is locked for VERIZON esim use only.
Oh well, guess gotta wait for another few month for newer updates to be able to use another network esim or firmware flashing that can enable this option soon...
Click to expand...
Click to collapse
If your device is the SM-G986U it's a Single SIM Device which doesn't at this point doesn't support eSim. Does the SIM Management Screen actually display the word "eSim"? Share a photo please. The device is likely still locked by Verizon. What is your motivation to change the Firmware to SM-G9860, do you live in Hong Kong?

Im sorry unfortunately I cant post links for my screenshots or upload any pictures..
If your device is the SM-G986U it's a Single SIM Device which doesn't at this point doesn't support eSim. Does the SIM Management Screen actually display the word "eSim"? Share a photo please. The device is likely still locked by Verizon. What is your motivation to change the Firmware to SM-G9860, do you live in Hong Kong?[/QUOTE]
I bought my phone online.. When I start up my phone it says Verizon, but its unlocked though because I can use any country physical simcard. Like right now im using my local simcard in Malaysia. I live in Malaysia and the reason I want to flash rom my SM-G986U device to Hong Kong firmware is so that I can use any eSim network in my country for my other network phone number.... If its a software for eSim that I can get for firmware that will be very helpful. Because the main local Malaysian samsung s20+ 5G firmware model is base on Exynos 990 which I doubt will fit for my US phone model..

I don't think you can flash SM-9860 Firmware onto your device but even if you could you still won't have eSim capability. Mix and matching firmware typically has more success on Exynos International Variants since they are Multi-CSC Enabled Devices. So if you have a British CSC (VOD) you may have success flashing German Firmware (VD2) since both CSC's are already stored in the device however even then some call features may not work. Snapdragon Devices don't have Multi-CSC's and as mentioned previously the Firmware is CSC Specific, they're made for one another. IF you had an Unlocked Bootloader, which you don't, there may be a method to modify the CSC once you root the device.. I did follow a thread a couple of years back where a gal had some success modifying her CSC on a Snapdragon Device but I believe that was a Galaxy S8. Also, I'm still curious if the word "eSim" actually appears in the SIM Management Screen on your device.

varcor said:
I don't think you can flash SM-9860 Firmware onto your device but even if you could you still won't have eSim capability. Mix and matching firmware typically has more success on Exynos International Variants since they are Multi-CSC Enabled Devices. So if you have a British CSC (VOD) you may have success flashing German Firmware (VD2) since both CSC's are already stored in the device however even then some call features may not work. Snapdragon Devices don't have Multi-CSC's and as mentioned previously the Firmware is CSC Specific, they're made for one another. IF you had an Unlocked Bootloader, which you don't, there may be a method to modify the CSC once you root the device.. I did follow a thread a couple of years back where a gal had some success modifying her CSC on a Snapdragon Device but I believe that was a Galaxy S8. Also, I'm still curious if the word "eSim" actually appears in the SIM Management Screen on your device.
Click to expand...
Click to collapse
Damn.. that is some nice insights.. I read a thread somewhere too that US SM-G986U cannot and will not be able to enable its OEM or unlocked bootloader.. the eSim actually doesnt appear in the Sim Management Screen on my device. I really want to upload some links of the screenshot but for now I cant do anything as Im a new member.. I just have to wait for the network shop to open up to change my current esim card to physical simcard.. its been 2 months plus of this coronavirus lockdown and our network providers cant do much about it too..
Anyways I really appreciate the insights, like you said even if I could flash in Hong Kong SM-9860 in to my US SM-G986U, I might run into some software or calls dysfunctionalities..

Anyone got th atct update for the sm-g9880 yet? Seems the u.s has got this update before Asia?

x88888x said:
Damn.. that is some nice insights.. I read a thread somewhere too that US SM-G986U cannot and will not be able to enable its OEM or unlocked bootloader.. the eSim actually doesnt appear in the Sim Management Screen on my device. I really want to upload some links of the screenshot but for now I cant do anything as Im a new member.. I just have to wait for the network shop to open up to change my current esim card to physical simcard.. its been 2 months plus of this coronavirus lockdown and our network providers cant do much about it too..
Anyways I really appreciate the insights, like you said even if I could flash in Hong Kong SM-9860 in to my US SM-G986U, I might run into some software or calls dysfunctionalities..
Click to expand...
Click to collapse
u typically cannot flash hk/china firmware onto us devices bcuz those models r typically oem unlockable and they make sure ppl cant just flash the firmware to a u model and unlock tye bl.. theyre typically signed with dif keys and would most likely fail instantly to flash

elliwigy said:
u typically cannot flash hk/china firmware onto us devices bcuz those models r typically oem unlockable and they make sure ppl cant just flash the firmware to a u model and unlock tye bl.. theyre typically signed with dif keys and would most likely fail instantly to flash
Click to expand...
Click to collapse
Thank you I understand..:crying: now I feel like I wanna sell my Verizon unlocked phone ?

tdevaughn said:
Oh, the Brazil variant. Still dont think it will work. They might be dual sim
Sent from my SM-G988U1 using Tapatalk
Click to expand...
Click to collapse
Do you think i can flash the Korean firmware on the SM G9860 BRI?

iNexusVitto said:
Do you think i can flash the Korean firmware on the SM G9860 BRI?
Click to expand...
Click to collapse
Not possible, the only options are flashing the SM-G9860 China or Hong Kong FW.

Is it possible to switch region / variant by flashing different firmware?

Hello,
Newbie question here coming from someone with Exynos model SM-G988B/DS (purchased while visiting Singapore):
Can I make this phone fully compatible with North American carriers? I'd like to use Wi-Fi Calling and VoLTE - but my Canadian carrier says that this phone is not eligible for these services because it's not a North American variant. A USSD code provided by my carrier was not successful (it said "invalid MMI code").
Even though I'm not entirely comfortable flashing different firmware onto Samsung phones - in this case I am desperate to do it (if it can be done to achieve my purpose at all...)
Now I'm kicking myself... wishing I knew that these calling features might not work back in Canada.
Thank you for your advice.

this is odd.. my phone is purchased in Malaysia, the country north of Singapore, and we have different CSC codes.
Wi-fi calling and VoLTE is working fine when i am in Singapore using a Singaporean SIM Card and when i back home in Malaysia using my Malaysian SIM Card. (But this is on the Samsung Note 8, have not gone to Singapore since i got my S20+ shortly before Malaysia shut down the borders due to the Covid-19 outbreak)

ctp9 said:
Hello,
Newbie question here coming from someone with Exynos model SM-G988B/DS (purchased while visiting Singapore):
Can I make this phone fully compatible with North American carriers? I'd like to use Wi-Fi Calling and VoLTE - but my Canadian carrier says that this phone is not eligible for these services because it's not a North American variant. A USSD code provided by my carrier was not successful (it said "invalid MMI code").
Even though I'm not entirely comfortable flashing different firmware onto Samsung phones - in this case I am desperate to do it (if it can be done to achieve my purpose at all...)
Now I'm kicking myself... wishing I knew that these calling features might not work back in Canada.
Thank you for your advice.
Click to expand...
Click to collapse
Short answer = you can't. You will need to change the "region key" (csc) by using samkey. If you flash the firmware belonging to different region with different csc code, you will not get any ota update at all. Therefore you must flash the firmware of, say, Canadian region, as well as changing the CSC to same set that Canada uses.
However: do *take note*, do *not* flash snapdragon firmware to exynos set vice versa.

vash_h said:
this is odd.. my phone is purchased in Malaysia, the country north of Singapore, and we have different CSC codes.
Wi-fi calling and VoLTE is working fine when i am in Singapore using a Singaporean SIM Card and when i back home in Malaysia using my Malaysian SIM Card. (But this is on the Samsung Note 8, have not gone to Singapore since i got my S20+ shortly before Malaysia shut down the borders due to the Covid-19 outbreak)
Click to expand...
Click to collapse
Yours works because those countries are still within the same region.
bluelavender said:
Short answer = you can't. You will need to change the "region key" (csc) by using samkey. If you flash the firmware belonging to different region with different csc code, you will not get any ota update at all. Therefore you must flash the firmware of, say, Canadian region, as well as changing the CSC to same set that Canada uses.
Click to expand...
Click to collapse
You're saying it cannot be done but then are telling me that it can be done using samkey. So which is it? Can I not flash North American firmware with the appropriate CSC?
However: do *take note*, do *not* flash snapdragon firmware to exynos set vice versa.
Click to expand...
Click to collapse
This is obvious - I would never do such a thing.

As its an exynos device it won't play well with usa networks and you cannot flash snapdragon firmware obviously. If you were in Europe this would have been easily done by changing the csc to say UK BTU via samkey and flashing the BTU firmware etc. Usa is a more complicated given the bands are different over there. Also you probably won't get carrier aggregation and volte / WiFi calling is a lottery! Plus usa networks aren't as chilled out as the rest of the world and have hissy fits if you don't use their branded devices. Charge way more than most other countries too! ?

ctp9 said:
Yours works because those countries are still within the same region.
You're saying it cannot be done but then are telling me that it can be done using samkey. So which is it? Can I not flash North American firmware with the appropriate CSC?
Click to expand...
Click to collapse
Not exactly. I'm in Singapore, using Taiwan set, with HK firmware & csc. It's 3 different regions
i'm saying it cannot be done by just flashing firmware like your original question
You *must* do both: update firmware *and* change csc. Now Samsung has locked the csc changing. You can no longer change csc by just flashing firmware of different region. It won't work. Change csc, then flash the firmware.

ctp9 said:
Yours works because those countries are still within the same region.
You're saying it cannot be done but then are telling me that it can be done using samkey. So which is it? Can I not flash North American firmware with the appropriate CSC?
This is obvious - I would never do such a thing.
Click to expand...
Click to collapse
It is different region as the csc is different.
In your case it is complicated. You can try to flash in your local csc file via odin. Just the csc file nothing else. See if it will work.
The firmware for exynos and snapdragon variants is very different.
---------- Post added at 04:45 AM ---------- Previous post was at 04:44 AM ----------
bluelavender said:
Not exactly. I'm in Singapore, using Taiwan set, with HK firmware & csc. It's 3 different regions
i'm saying it cannot be done by just flashing firmware like your original question
You *must* do both: update firmware *and* change csc. Now Samsung has locked the csc changing. You can no longer change csc by just flashing firmware of different region. It won't work. Change csc, then flash the firmware.
Click to expand...
Click to collapse
He cannot and must not flash sd firmware into exynos phone. It'll brick the phone. Taiwan and hk is sd variant.

Ok - thank you for your responses so far.
So what is the absolute best thing that could be done in order to be *the most* compatible with North American carriers? What CSC should I be aiming for and which firmware to be exact? Could someone please link me to the appropriate files? I'll do my research once I have an idea of what to start with. (If it won't work - I obviously won't bother with it... but I think I should do some more research before I completely give up...)

vash_h said:
He cannot and must not flash sd firmware into exynos phone. It'll brick the phone. Taiwan and hk is sd variant.
Click to expand...
Click to collapse
Yes, I advised him same thing in my earlier post above. sd & exynos rom is not interchangeable.
---------- Post added at 05:52 AM ---------- Previous post was at 05:48 AM ----------
ctp9 said:
Ok - thank you for your responses so far.
So what is the absolute best thing that could be done in order to be *the most* compatible with North American carriers? What CSC should I be aiming for and which firmware to be exact? Could someone please link me to the appropriate files? I'll do my research once I have an idea of what to start with. (If it won't work - I obviously won't bother with it... but I think I should do some more research before I completely give up...)
Click to expand...
Click to collapse
you're in tough luck. USA bands are different from most of the world (https://sea.pcmag.com/smartphones/3...-americas-first-unlocked-all-carrier-5g-phone). To top it off, your set is exynos, and even if you can get firmware that works for USA set, it is most likely will be in snapdragon.
Btw, exynos version will never support mmwave in USA carriers, simply because exynos version does not have mmwave antenna.
I would suggest you sell that exynos set / exchange it to snapdragon set. With snapdragon, you have more luck finding compatible firmware.

Well... I cannot particularly exchange this device now that I'm in Canada and I've had it for over a month. And no one here would want to buy it since it's not local to the continent. I'm stuck with it here now.
I'll just use it for a year and then get some other new phone next year that's local to my region. There's a few other things I do not like about this latest Galaxy anyway... and I cannot see myself using it for longer than a year. What a pity though - I used to be such a die hard Samsung fan until this latest flagship. They screwed up so many things, namely - the battery life and camera quality.

ctp9 said:
What a pity though - I used to be such a die hard Samsung fan until this latest flagship. They screwed up so many things, namely - the battery life and camera quality.
Click to expand...
Click to collapse
That's precisely why I do not want to use local version here, which is exynos, the one you brought there.. snapdragon version is *miles ahead* and really is the flagship quality. I don't have issue with camera, the battery is insanely efficient (I have 2 WhatsApp, 2 telegram, email real-time-push, wechat, line, fb, etc) and I only drain 4% per 8 hours at night with all notifications still coming in
Yes, that's the snapdragon version, the real s20 flagship.

Try switching off 120hz. I'm happy with my 60Hz. Battery is pretty good, i usually unplig my charger at 630am.. It'll last me to 10pm with about 30% charge left.
This includes occasional messaging on telegram and whatsapp, some email checking and Facebook browsing. Working hours I'll be on office wifi. Lunch hour and after work 530pm to 630pm is my pokemon go hour which is the only time my wife let's me play games.
My phone is s20+ 4G variant, usually on 4G+, dual sim and 1 micro sd card (one of the sim is the esim). My display is at wqhd+ at 60Hz.
So far im happy with the battery life.
Just this morning, taking advantage of my wifes absence, did some gaming, namely war machines, the tank fps game and pokemon go.. From 630am to 1130am, Facebook and tiktok when I'm preparing and eating my breakfast. my phone is left with 60% charge.

Hello,
I would buy Snapdragon / Hong Kong version because I hate Exynos problems, but I'm a bit confused about CSC.
I've read the topic, and I understood that I can't flash Exynos (European) firmware on the Snapdragon / Hong Kong version.
Some people bought Hong Kong version and works very well in my country frequencies, but I would use Samsung Pay.
What will happen if I change CSC/flash to any european CSC? It would work or not?
Thank you a lot.

psychok9 said:
Hello,
I would buy Snapdragon / Hong Kong version because I hate Exynos problems, but I'm a bit confused about CSC.
I've read the topic, and I understood that I can't flash Exynos (European) firmware on the Snapdragon / Hong Kong version.
Some people bought Hong Kong version and works very well in my country frequencies, but I would use Samsung Pay.
What will happen if I change CSC/flash to any european CSC? It would work or not?
Thank you a lot.
Click to expand...
Click to collapse
Samsung pay might work if the card supports samsung pay. But no way to know for sure until someone test it themselves.
Sent from my SM-G985F using Tapatalk

bluelavender said:
Not exactly. I'm in Singapore, using Taiwan set, with HK firmware & csc. It's 3 different regions
i'm saying it cannot be done by just flashing firmware like your original question
You *must* do both: update firmware *and* change csc. Now Samsung has locked the csc changing. You can no longer change csc by just flashing firmware of different region. It won't work. Change csc, then flash the firmware.
Click to expand...
Click to collapse
Hey man, can you make a link a guide on how to change the CSC and Flash the firmware?
I have an s20 Ultra Exynos from Indonesia, and want to change the to Korean CSC and flash the firmware.
---------- Post added at 09:20 PM ---------- Previous post was at 09:18 PM ----------
bluelavender said:
Yes, I advised him same thing in my earlier post above. sd & exynos rom is not interchangeable.
---------- Post added at 05:52 AM ---------- Previous post was at 05:48 AM ----------
you're in tough luck. USA bands are different from most of the world (https://sea.pcmag.com/smartphones/3...-americas-first-unlocked-all-carrier-5g-phone). To top it off, your set is exynos, and even if you can get firmware that works for USA set, it is most likely will be in snapdragon.
Btw, exynos version will never support mmwave in USA carriers, simply because exynos version does not have mmwave antenna.
I would suggest you sell that exynos set / exchange it to snapdragon set. With snapdragon, you have more luck finding compatible firmware.
Click to expand...
Click to collapse
Wait what? Exynos definitely has MMwave antennae! If it doesn't that's news to me. Where did you see information that states that?

eyeatoma said:
Hey man, can you make a link a guide on how to change the CSC and Flash the firmware?
I have an s20 Ultra Exynos from Indonesia, and want to change the to Korean CSC and flash the firmware.
---------- Post added at 09:20 PM ---------- Previous post was at 09:18 PM ----------
Wait what? Exynos definitely has MMwave antennae! If it doesn't that's news to me. Where did you see information that states that?
Click to expand...
Click to collapse
On Exynos & mmwave: https://www.bitfeed.co/2020/03/15/s...s-completely-disassembled-no-antennas-mmwave/ and https://eu.community.samsung.com/t5...-5G-supported-5G-networks/td-p/1577262/page/2
btw, you cannot flash Korean firmware to exynos. Korean S20 are all now using snapdragon

How do i unlock my Sim Network on Galaxy A71 5G T-Mobile carrier?
Please guys, how do i unlock my local sim network here in Nigeria?
I bought a second hand used Samsung Galaxy A71 5g from a vendor here. My local network won't work on the phone, telling me it's locked. The phone runs on a Snapdragon chip.
I'm really desperate about unlocking the network, how to i go about this?

bluelavender said:
Short answer = you can't. You will need to change the "region key" (csc) by using samkey. If you flash the firmware belonging to different region with different csc code, you will not get any ota update at all. Therefore you must flash the firmware of, say, Canadian region, as well as changing the CSC to same set that Canada uses.
However: do *take note*, do *not* flash snapdragon firmware to exynos set vice versa.
Click to expand...
Click to collapse
What are you on about ? Short answer = Yes you can! I've been on Germany CSC (Im UK based) I've been on Abu Dhabi region and i was getting my OTA updates with no issues i think you were confused with a root as that breaks your phone.

ctp9 said:
Well... I cannot particularly exchange this device now that I'm in Canada and I've had it for over a month. And no one here would want to buy it since it's not local to the continent. I'm stuck with it here now.
I'll just use it for a year and then get some other new phone next year that's local to my region. There's a few other things I do not like about this latest Galaxy anyway... and I cannot see myself using it for longer than a year. What a pity though - I used to be such a die hard Samsung fan until this latest flagship. They screwed up so many things, namely - the battery life and camera quality.
Click to expand...
Click to collapse
Did you able to change to csc or firmware of taiwan version

SM-G9880 Flashing Question

I recently just bought a S20 Ultra that has a unlockable bootloader. A little while back, I had a Galaxy S9 that I could completely convert the entire device to U1. Is that even possible with this device ? To fully convert the CSC and bootloader ect, to a US model ?

cjegan2008 said:
I recently just bought a S20 Ultra that has a unlockable bootloader. A little while back, I had a Galaxy S9 that I could completely convert the entire device to U1. Is that even possible with this device ? To fully convert the CSC and bootloader ect, to a US model ?
Click to expand...
Click to collapse
That was then. Each model is specific to a region and can not be flash with software from another region. I.E you cannot flash G9880 with firmware from G988U or G988U1 or the other way around.

What exactly changed from the S9 to the S20 that made that impossible ?
west2cool said:
That was then. Each model is specific to a region and can not be flash with software from another region. I.E you cannot flash G9880 with firmware from G988U or G988U1 or the other way around.
Click to expand...
Click to collapse

cjegan2008 said:
What exactly changed from the S9 to the S20 that made that impossible ?
Click to expand...
Click to collapse
Any luck? I just got one in Canada and it only has 3g ad 4g so I was hoping I could flash a csc file.

So I attempted to edit the band config using QPST and QXDM, but I'm very unfamiliar with both programs and how to actually read and write information to the modem using those programs. Definitely not for the average user. Back in the days when devices had ESN numbers, I used to flash software using QPST and QXDM but there is a lot that has changed with those programs, and I wouldn't even know how to do that stuff today. If anyone has any knowledge about those two programs that can help me unlock all the US 5G bands for AT&T and Verizon that would extremely helpful.
dwhite011 said:
Any luck? I just got one in Canada and it only has 3g ad 4g so I was hoping I could flash a csc file.
Click to expand...
Click to collapse

Carrier firmware

I currently have the US s20Ultra unlocked model on ATT (don't foresee changing carriers). Currently I am missing features like VoLTE and VVM. What other features would I be missing if I stay on the unlocked firmware? Can I flash the ATT firmware to get those missing features? Can I flash back to unlock?
Thank you

What's the CSC on your device?

varcor said:
What's the CSC on your device?
Click to expand...
Click to collapse
I am not sure what I am looking for. Its currently on ATT/ATT.

Open your dialer, enter *#1234#, press the Dial Icon. You'll see CSC: G98??, the next 3 letters will be your device's CSC Code. Your Service Provider's CSC is "ATT" which is different than the CSC in your device. Whether or not you can change the CSC depends on your device's CSC. Device firmware is always configured for the specific, original CSC or Multi CSC's.
This post may be the best workaround.
https://forum.xda-developers.com/showpost.php?p=82444733&postcount=8

varcor said:
Open your dialer, enter *#1234#, press the Dial Icon. You'll see CSC: G98??, the next 3 letters will be your device's CSC Code. Your Service Provider's CSC is "ATT" which is different than the CSC in your device. Whether or not you can change the CSC depends on your device's CSC. Device firmware is always configured for the specific, original CSC or Multi CSC's.
This post may be the best workaround.
https://forum.xda-developers.com/showpost.php?p=82444733&postcount=8
Click to expand...
Click to collapse
My CSC: G988U1OYM1ATE4

garyHal said:
My CSC: G988U1OYM1ATE4
Click to expand...
Click to collapse
Your device has Multiple CSC's which are included in OYM so you should be able to change your CSC to ATT, which is the CSC for AT&T.
Go to "Settings" then "About phone". Write down your IMEI Number. Open dialer and enter *#272*IMEInumber# (In the thread replace IMEInumber with your actual IMEI Number). Press the Dial Icon, you should see a screen with the list of available CSC codes for your device. Select ATT and tap the Install option.
Be aware your firmware isn't AT&T, it's unbranded so even if you change the CSC, full call functionality may not be available. You can obtain AT&T's firmware at SamMobile.
https://www.sammobile.com/samsung/galaxy-s20-ultra/firmware/SM-G988U1/ATT/

varcor said:
Your device has Multiple CSC's which are included in OYM so you should be able to change your CSC to ATT, which is the CSC for AT&T.
Go to "Settings" then "About phone". Write down your IMEI Number. Open dialer and enter *#272*IMEInumber# (In the thread replace IMEInumber with your actual IMEI Number). Press the Dial Icon, you should see a screen with the list of available CSC codes for your device. Select ATT and tap the Install option.
Be aware your firmware isn't AT&T, it's unbranded so even if you change the CSC, full call functionality may not be available. You can obtain AT&T's firmware at SamMobile.
https://www.sammobile.com/samsung/galaxy-s20-ultra/firmware/SM-G988U1/ATT/
Click to expand...
Click to collapse
Varcor, thank you so much for all the directions.
As it stands right now, it is already on ATT. Once I flash over to the ATT firmware, would I be able to flash back to an unbranded one in the future, for whatever reason? Additionally, do I have to stay on the ATT firmware to retain those features? Or could just having my phone communicate with ATT at least once with my "branded" phone and then flash back retain those features?

garyHal said:
Varcor, thank you so much for all the directions.
As it stands right now, it is already on ATT. Once I flash over to the ATT firmware, would I be able to flash back to an unbranded one in the future, for whatever reason? Additionally, do I have to stay on the ATT firmware to retain those features? Or could just having my phone communicate with ATT at least once with my "branded" phone and then flash back retain those features?
Click to expand...
Click to collapse
You're most welcome. Yes, flashing back to unbranded won't be a problem. I don't think you will be able to retain the features if you go back to the unbranded firmware, it's not configured to allow full call feature functionality. Also, after flashing to the AT&T firmware you may need to contact their CSR for external programing. Good luck!

S20+ AT&T
Hi Varcor,
I'm new in this firmware things. I'm from Singapore and has been using S20 Exynos, but due to the extreme heat, bad battery life,etc. I've decided to import S20+ Snapdragon from AT&T, according to the Service provider SW ver information, it's showing as SAOMC_SM-G986U-OYN_ATT_QQ_0023 (I believe this means the set are unlocked).
With that said, I noticed that the software is outdated and the security patch level is on February 1,2020. when I referring to the AT&T website, It's showing as the latest software is QP1A.190711.020.G986USQU1ATE6 (June update) and mine still on QP1A.190711.020..G986USQU1ATAW (February). My CSC is G986UOYN1ATAW.
My question now is, whenever I tried to hit the software update, it's keep telling me that my software is up to date. Is there's a reason why it's wont detect the update? If it's because I'm in Singapore not US, then there's no choice that I need to flash using the firmware from Sammobile. The problem is which one that I need to download as AT&T carrier is not listed there. There's only T-mobile, Sprint, Unknown, USA. Please help.
https://www.sammobile.com/samsung/galaxy-s20-plus/firmware/#SM-G986U

Raigar said:
Hi Varcor,
I'm new in this firmware things. I'm from Singapore and has been using S20 Exynos, but due to the extreme heat, bad battery life,etc. I've decided to import S20+ Snapdragon from AT&T, according to the Service provider SW ver information, it's showing as SAOMC_SM-G986U-OYN_ATT_QQ_0023 (I believe this means the set are unlocked).
With that said, I noticed that the software is outdated and the security patch level is on February 1,2020. when I referring to the AT&T website, It's showing as the latest software is QP1A.190711.020SAOMC_SM-G986U-OYN_ATT_QQ_0023 (June update) and mine still on QP1A.190711.020..G986USQU1ATAW (February). My CSC is G986UOYN1ATAW.
My question now is, whenever I tried to hit the software update, it's keep telling me that my software is up to date. Is there's a reason why it's wont detect the update? If it's because I'm in Singapore not US, then there's no choice that I need to flash using the firmware from Sammobile. The problem is which one that I need to download as AT&T carrier is not listed there. There's only T-mobile, Sprint, Unknown, USA. Please help.
https://www.sammobile.com/samsung/galaxy-s20-plus/firmware/#SM-G986U
Click to expand...
Click to collapse
I would reach out to SamMobile and inquire why they're not listing the AT&T Firmware Update. You state your CSC is G986UOYN1ATAW. That CSC is also associated with T-Mobile. You're not using an AT&T SIM Card, correct? On a Multi-CSC Device when you insert a different SIM, the device should update to the correct Service Provider. If you're using a SIM from a Service Provider other than AT&T you probably won't receive AT&T Software Updates, which are distributed by Samsung, not AT&T via OTA.

varcor said:
I would reach out to SamMobile and inquire why they're not listing the AT&T Firmware Update. You state your CSC is G986UOYN1ATAW. That CSC is also associated with T-Mobile. You're not using an AT&T SIM Card, correct? On a Multi-CSC Device when you insert a different SIM, the device should update to the correct Service Provider. If you're using a SIM from a Service Provider other than AT&T you probably won't receive AT&T Software Updates, which are distributed by Samsung, not AT&T via OTA.
Click to expand...
Click to collapse
I did try to reach them, but for some reason they are giving me some irrelevant answer. Something like "You probably don't get OTA-updates (otherwise you got them already from AT&T)". We are having a conversation breakdown there, I think they are not an english speaker (or my english is just bad). Really? that CSC is associated with T-Mobile? now I'm getting more confused because the box is stated AT&T and it's sealed.
I'm using Singapore SIM card (Singtel), so you were saying this set I'm using right now is a Multi-CSC device? If i were to flash to the other carrier firmware, will it create any problem?

Raigar said:
I did try to reach them, but for some reason they are giving me some irrelevant answer. Something like "You probably don't get OTA-updates (otherwise you got them already from AT&T)". We are having a conversation breakdown there, I think they are not an english speaker (or my english is just bad). Really? that CSC is associated with T-Mobile? now I'm getting more confused because the box is stated AT&T and it's sealed.
I'm using Singapore SIM card (Singtel), so you were saying this set I'm using right now is a Multi-CSC device? If i were to flash to the other carrier firmware, will it create any problem?
Click to expand...
Click to collapse
Flashing Singtel Firmware won't work since it's configured for the Exynos SoC. Multi-SIM Devices have only regional Service Providers available, you don't have Singtel as an option in an AT&T device. Based on your situation I would consider one of two options. The first would be insert an AT&T SIM just for OTA updates. Not sure if you received an AT&T SIM when you purchased the device, if you didn't they're not hard to find. The second and likely best option is sell the device and purchase a Global Variant with a Snapdragon SoC, you'll receive updates regardless of your Service Provider. If it makes you feel any better there's lots of users in the same predicament. They want the Snapdragon device in regions selling mainly Exynos devices. Workarounds are in many situations are challenging,

varcor said:
Your device has Multiple CSC's which are included in OYM so you should be able to change your CSC to ATT, which is the CSC for AT&T.
Go to "Settings" then "About phone". Write down your IMEI Number. Open dialer and enter *#272*IMEInumber# (In the thread replace IMEInumber with your actual IMEI Number). Press the Dial Icon, you should see a screen with the list of available CSC codes for your device. Select ATT and tap the Install option.
Be aware your firmware isn't AT&T, it's unbranded so even if you change the CSC, full call functionality may not be available. You can obtain AT&T's firmware at SamMobile.
https://www.sammobile.com/samsung/galaxy-s20-ultra/firmware/SM-G988U1/ATT/
Click to expand...
Click to collapse
Varcor
I have the exact same phone and using the same network as garyHal, unlocked 988U1/OYM/ATT.
I got my bootloader unlocked and decided to apply the ATT firmware (
G988U1UES1BTJ2). My CSC was already ATT so I didn't perform the csc install step.
After setting the phone up as new, it still seems like its running the unlocked mode. I don't see any kind of branding or extra ATT stuff that may have been downloaded. How do I verify that I have the right firmware and CSC set to ATT?
Thank you.

itchyUnder said:
Varcor
I have the exact same phone and using the same network as garyHal, unlocked 988U1/OYM/ATT.
I got my bootloader unlocked and decided to apply the ATT firmware (
G988U1UES1BTJ2). My CSC was already ATT so I didn't perform the csc install step.
After setting the phone up as new, it still seems like its running the unlocked mode. I don't see any kind of branding or extra ATT stuff that may have been downloaded. How do I verify that I have the right firmware and CSC set to ATT?
Thank you.
Click to expand...
Click to collapse
How did you manage to unlock your bootloader since US Snapdragon variants are locked down pretty tight? I don't think the firmware is dedicated to ATT, it's Multi CSC, designed to function with a number of US Carriers. You should be delighted you're not suffering with ATT bloatware! To check the Active CSC go to About Phone, Settings, Software Information, Service Provider SW ver. On the bottom string the first three letters are the Active CSC on your device. You can review this article for additional information on Firmware and CSC's.
CSC and Home_CSC | All You Need to Know About ODIN Samsung Flash
Here is all you need to know about the CSC and Home_CSC.What exactly is a Firmware?A firmware is nothing but a permanent software which is programme
www.getdroidtips.com

varcor said:
How did you manage to unlock your bootloader since US Snapdragon variants are locked down pretty tight? I don't think the firmware is dedicated to ATT, it's Multi CSC, designed to function with a number of US Carriers. You should be delighted you're not suffering with ATT bloatware! To check the Active CSC go to About Phone, Settings, Software Information, Service Provider SW ver. On the bottom string the first three letters are the Active CSC on your device. You can review this article for additional information on Firmware and CSC's.
CSC and Home_CSC | All You Need to Know About ODIN Samsung Flash
Here is all you need to know about the CSC and Home_CSC.What exactly is a Firmware?A firmware is nothing but a permanent software which is programme
www.getdroidtips.com
Click to expand...
Click to collapse
If I am reading it correctly, this is what I am seeing:
ATT/ATT/XAA
I am happy that I don't have the ATT bloatware but I also feel that ATT is locking me out of some of their features because I don't have a "branded" phone, such as wifi call or visual voicemail. Am I misunderstanding your post from above, #6, that flashing ATT firmware would give me the carrier features?
Additionally, does the firmware determine what frequency bands I am using and if I am taking full advantage of ATT's offerings?

itchyUnder said:
If I am reading it correctly, this is what I am seeing:
ATT/ATT/XAA
I am happy that I don't have the ATT bloatware but I also feel that ATT is locking me out of some of their features because I don't have a "branded" phone, such as wifi call or visual voicemail. Am I misunderstanding your post from above, #6, that flashing ATT firmware would give me the carrier features?
Additionally, does the firmware determine what frequency bands I am using and if I am taking full advantage of ATT's offerings?
Click to expand...
Click to collapse
Flashing ATT Dedicated Firmware would give you the best chance for additional call features ASSUMING your Ulocked Device is capable of incorporating those features. It should do the trick since the hardware is identical to an ATT device. I would head to an ATT Store to get a definitive answer. Samsung has made it more and more challenging to mix and match branded and unlocked devices with CSC or Firmware modifications. In many cases you won't know until you try. Users want their smartphones to be smart, to work perfectly in every situation but the major carriers use proprietary tools to hold clients hostage.

varcor said:
Open your dialer, enter *#1234#, press the Dial Icon. You'll see CSC: G98??, the next 3 letters will be your device's CSC Code. Your Service Provider's CSC is "ATT" which is different than the CSC in your device. Whether or not you can change the CSC depends on your device's CSC. Device firmware is always configured for the specific, original CSC or Multi CSC's.
This post may be the best workaround.
https://forum.xda-developers.com/showpost.php?p=82444733&postcount=8
Click to expand...
Click to collapse
Please bro i need a help
My note 20 ultra is ATT unlocked
Because I'm not in united state
But in section about phone
My model is N986U note U1
am searching sammobil to udate my phone to android 13
I found nothing at&t with my model number N986U
Only N986U1
What should I do to update to android 13

This should do the trick.
Download Samsung Galaxy Note 20 Ultra 5G SM-N986U USC USA (US Cellular) firmware
All Samsung firmwares for Galaxy Note 20 Ultra 5G in USA (US Cellular) with model code SM-N986U. We offer free and fast download options. Check them out now.
www.sammobile.com

romano_ezzat said:
Please bro i need a help
My note 20 ultra is ATT unlocked
Because I'm not in united state
But in section about phone
My model is N986U note U1
am searching sammobil to udate my phone to android 13
I found nothing at&t with my model number N986U
Only N986U1
What should I do to update to android 13
Click to expand...
Click to collapse
Download Samsung Galaxy Note 20 Ultra 5G SM-N986U USC USA (US Cellular) firmware
All Samsung firmwares for Galaxy Note 20 Ultra 5G in USA (US Cellular) with model code SM-N986U. We offer free and fast download options. Check them out now.
www.sammobile.com

varcor said:
This should do the trick.
Download Samsung Galaxy Note 20 Ultra 5G SM-N986U USC USA (US Cellular) firmware
All Samsung firmwares for Galaxy Note 20 Ultra 5G in USA (US Cellular) with model code SM-N986U. We offer free and fast download options. Check them out now.
www.sammobile.com
Click to expand...
Click to collapse
I misunderstanding
What a trick bro
It's a link for firmware updates
I need to know which one compatible with my note
And after flash will still unlocked?