Develop Bugs

Modifying CSC to enable OCONUS LTE?

Issue: using 3 in the UK and they are running LTE Bands 3 and 20. I am looking at my wife's phone next to mine and she is camped on 3's Band 20. I am using an N900t and it won't allow me to enable those bands, even when forcing to either of them in the service mode. I'm running the OB6 firmware, CSC, and bootloader. The ROM is an Alliance TW 5.0 with TWRP as my recovery. I've also enabled CA as well as LTE Rev 10 to no avail.
I don't know much about how this OS works, but I am thinking that the baseband is reading the CSC and disabling the OCONUS LTE Bands, which is why they won't enable in the service mode. There is no other CSC for that firmware on sammobile, and I've read that flashing a mismatched CSC can cause incompatibility issues.
Thoughts?

The more I research, the more I'm confused. Can I use a CSC changer to change to the 3 UK region? I understand this will wipe the phone, but then will a nandroid backup reinstall everything on top of the CSC or well a nandroid replace the CSC? Will/should I have issues with a TMO fw/bl and non-TMO CSC?

CSC is a custom sales code. You can try changing it but I don't think this will help because the phone's software works with the installed modem software. Changing the csc doesn't change the modem software.

I thought the modem, to speak generally, was the set of drivers needed for everything to communicate correctly, while the CSC was the region and brand-specific coding that include the bands in which the hardware should search. Not correct? There are other stories of people flashing different region files and then have access to other bands.

The CSC is something added to the ROM to make it carrier specific. For instance, adding a T-Mobile USA CSC to an AT&T Samsung s4 will not allow the S4 to connect to T-mobile's network. Additional software modifications must be made to enable these additional frequency bands.
You can try to change the CSC but the CSC must exist for the particular carrier on the particular phone.

The good thing is that, from what I've read, there exists an international note 3 on 3's network. Does that mean, since it exists, I need to flash the international fw/bl and csc? I think it's the 9005.

The n9005 and T-Mobile note 3 support different frequencies and the n9005 has never been able to receive LTE in North America, regardless of what is done through software changes.
You will not be able to flash the bootloader via Odin but you may be able to flash it via TWRP. However, flashing an n9005 bootloader onto the n900t will probably hardbrick the phone and I advise against cross-flashing bootloaders.

"Hard-brick" as in unrecoverable or I'll just have to start over?

Hard brick means having it fixed at a repair shop, if possible.

Samsung pay n975u1 in Canada?

Hello,
I recently purchased a note 10+ unlocked version from the states and live in Canada. I've updated the phone and everything, but the samsung pay app does not look like the Canada one and when I try to add a card, it asks for a zip code. I've tried uninstalling the app, clearing the cache, etc and re-downloading it; but to no avail. Can I try factory data reset with the Canadian Sim in? Under software information, it shows XAA which upon my research, indicates that it is USA unbranded firmware.
Is there some Canadian firmware I have to install? Where can I find it? Thank you.

crushdancexz said:
Hello,
I recently purchased a note 10+ unlocked version from the states and live in Canada. I've updated the phone and everything, but the samsung pay app does not look like the Canada one and when I try to add a card, it asks for a zip code. I've tried uninstalling the app, clearing the cache, etc and re-downloading it; but to no avail. Can I try factory data reset with the Canadian Sim in? Under software information, it shows XAA which upon my research, indicates that it is USA unbranded firmware.
Is there some Canadian firmware I have to install? Where can I find it? Thank you.
Click to expand...
Click to collapse
You will have to flash the SM-N975W firmware which is the variant that's sold by Samsung in Canada.
You'll want the XAC CSC which is for Canadian unbranded, similar to XAA for USA.
The firmware can be downloaded through SamFirm or Frija and should be flashed with the patched version of Odin 3.13.1 to allow cross-flashing from N975U1 to N975W.
https://androidfilehost.com/?fid=6006931924117912211
After you install the XAC firmware, remove your Canadian SIM card, restart the device once and then do a factory reset to confirm that it has been switched to XAC. After that you will be able to install the Canadian variant of Samsung Pay, as well as use other carrier features like VoLTE and WiFi calling if available.

MeltdownSpectre said:
You will have to flash the SM-N975W firmware which is the variant that's sold by Samsung in Canada.
You'll want the XAC CSC which is for Canadian unbranded, similar to XAA for USA.
The firmware can be downloaded through SamFirm or Frija and should be flashed with the patched version of Odin 3.13.1 to allow cross-flashing from N975U1 to N975W.
https://androidfilehost.com/?fid=6006931924117912211
After you install the XAC firmware, remove your Canadian SIM card, restart the device once and then do a factory reset to confirm that it has been switched to XAC. After that you will be able to install the Canadian variant of Samsung Pay, as well as use other carrier features like VoLTE and WiFi calling if available.
Click to expand...
Click to collapse
Thank you. I replied in the other thread.

Change Modem (CP) for G981U1 for use in Europe?

...because I use the phone in Europe. Given the firmware is North America I was wondering whether I need to change the modem in ODIN to get better reception/ 5g in Europe. The last Samsung I owned was the S4 where updating the modem to your region was ubiquitary. Not sure if this is still necessary and doable., so hoping for some advice.
Second question: I have a US S20 locked to AT&T. Will flashing the U1 firmware (incl. factory reset) also unlock the phone?
Cheers!

tpunkttpunkt said:
...because I use the phone in Europe. Given the firmware is North America I was wondering whether I need to change the modem in ODIN to get better reception/ 5g in Europe. The last Samsung I owned was the S4 where updating the modem to your region was ubiquitary. Not sure if this is still necessary and doable., so hoping for some advice.
Second question: I have a US S20 locked to AT&T. Will flashing the U1 firmware (incl. factory reset) also unlock the phone?
Cheers!
Click to expand...
Click to collapse
You can't mix exynos firmware and Snapdragon. I doubt you can use just the modem portion of a European exynos code. You can flash U1 code freely, but that does not unlock the bootloader. Do you mean you can't put any sim other than AT&T?

I didn't mean to unlock the bootloader (since that's not possible for US phones) but the sim so I can use my German sim card in Europe in this phone.

tpunkttpunkt said:
I didn't mean to unlock the bootloader (since that's not possible for US phones) but the sim so I can use my German sim card in Europe in this phone.
Click to expand...
Click to collapse
Do you know if I run the risk to brick my device if I tried to combine the exynos modem with a snapdragon rom? Cause otherwise I might just try it.

Question flashing global firmware to unlocked AT&T S22

Hi everyone,
I am planning to get an unlocked S22 (AT&T unlocked, fully paid off) from the USA to my country (India). The box says it is following:
Model: SM-S901U
S/W: S901USQU1AVA7
Even though it is unlocked, i can see the SM-S901U does not support 2 5G bands which are used my in country (unlike the generic unlocked SM-S901U1). My question is that,
1) Since the s22 is basically from samsung, with the carrier models having control over the software, will i be able to flash to the generic unlocked firmware and model SM-S901U1 and get support for the other 5g bands too (i see the generic unlocked version SM-S901U1 has the 2 other bands that i need)?
2) Will the hotspot work and will i be able to recive OTA updates?
3) And the main question, will i require an AT&T SIM for the flashing process?
I was digging around the ultra thread for some info:
OTA and Non-OTA Firmware for S22 Ultra SM-S908U and S22 Ultra SM-S908U1 Versions
See Post #2 and #3 for the Links to the Firmware All of the firmware posted here can be flashed on any U or U1 Device. Each of the firmware's are NOT carrier dependent and only has carrier labels listed in order to have an idea if you might get...
forum.xda-developers.com
If someone can help/guide me, i'd be great!
Thanks and Cheers!

1. You will be able to flash s901u1 firmware (you will need a patched version of Odin to do so) but it still will not have the 5g bands, it's a hardware thing.
2. Hotspot will still work and you will be able to receive OTA updates when on s901u1 firmware.
3. No you will not, even when the phone is locked you will still not require a sim

Kesh2cute said:
1. You will be able to flash s901u1 firmware (you will need a patched version of Odin to do so) but it still will not have the 5g bands, it's a hardware thing.
2. Hotspot will still work and you will be able to receive OTA updates when on s901u1 firmware.
3. No you will not, even when the phone is locked you will still not require a sim
Click to expand...
Click to collapse
Thanks for such a quick reply
I had thought that the bands were locked via firmware (was hoping that samsung gave control to the carriers to control the bands via software). Sadly that doesn't seem to be the case
Since the s901u1 has those bands available (i checked here: https://devicebeast.com/devices/samsung-sm-s901u1-galaxy-s22-5g-uw-dual-sim-td-lte-us-256gb), i guess that will be a better buy for 5G.

Question AT&T G990U2 to T-Mobile or unbranded firmware help needed

I would appreciate if anyone can point me to the right direction. I have 21FE G990U2 from AT&T, It is unlocked by AT&T.
All I need is working T-Mobile firmware or Samsung (no carrier branding) to flash. I tried multiple versions of U, U1 and U3 firmwares (all matching my current Binary -4) but no success.
I just would like to get rid of ATT bloat. I know I can uninstall it via ADB but I rather have firmware clean of it.
Any suggestion please?
Thanks

So am I right to assume that you are looking for a G990U2 TMB firmware with Binary 4, to flash on a G990U2 AT&T phone?
If so, then you can download it from the below link by clicking on "Download Samfw server" (G990U2OYN4EWC3, April 2023 update):
Download Galaxy S21 FE 5G SM-G990U2 (TMB) G990U2SQS4EWC3 in Samfw - Samsung firmware download
Galaxy S21 FE 5G SM-G990U2 (TMB - United States) G990U2SQS4EWC3 T(Android 13) samsung firmware download all model, lastest, fast update, completely free and fast speed in Samfw.com ✅
samfw.com
or if I am assuming wrong, can you please correct my understanding? As I do not have any practical hands-on experience with the USA models.

Shuhan44 said:
So am I right to assume that you are looking for a G990U2 TMB firmware with Binary 4, to flash on a G990U2 AT&T phone?
If so, then you can download it from the below link directly (G990U2OYN4EWC3, April 2023 update):
https://02-samsung.cloud/v2/IxJCDiMnLh8SLAo5IRtBAzwDMyMyCB4lFzssIDs2ByAzMUEgOzEUQDMQMCMBOyw/LiUzJjIXCDkuJC8/NDseIy8xIQYzOAIlPDAVHRIvMz81CAIkMwsuOB42FA00Nh4LNS8vFjIXLA0NFzE/PAMeOTMADTkDAC4mNBEaMCExQQEhJQUUHjFCMTs4BkIjCyI/Iws8MQEWCDAeCw0xCREHOTQbIyshAD4OIQAGLC44Hiw0ER4OMiUzLDIlDSs8AD4fJhsGOg8HCkA8AywnCRc+Di8LBxAzBy4RDxYpKTwkHjUeBylCJgceKTIXIUAJER4OMi8+AwMSMBsBAzY5LwNBJi8IMAQ4MTQUAQMgLyMsHjM7JDMHLzEjJDgAISk8PxQ9NTggQiYbLyUhJCEpMjsHJzw2KSceFy4QIzEvKw8WIAYhFh4JMjAeLDQsLCM0Gy45IzgGQiMDPB0jJCI/ARYFMCMiExM=
or if I am assuming wrong, can you please correct my understanding? As I do not have any practical hands-on experience with the USA models.
Click to expand...
Click to collapse
You are correct - I need T-Mobile (or carrier free) so I can utilize full carrier settings.
Thanks for the link, however above link gives an error when opening the page.
Nevertheless I will look for TMB firmware with CSC: G990U2OYN4EWC3 and post an update here

Flashed that and still has AT&T boot logo and all the apps

h078 said:
Flashed that and still has AT&T boot logo and all the apps
Click to expand...
Click to collapse
Well, I am sure that you have flashed by a Factory reset (Flashed CSC, not Home CSC in ODIN). The boot logo can be changed by rooting your device, also bloatware apps can be deleted via ADB command without rooting.. but you already have mentioned that you prefer not to proceed with those processes. So I am out of suggestions, sorry.
Just for my knowledge, after flashing the TMB firmware, now your settings> About phone> software information> service provider software version: 2nd line shows as TMB/ TMB/ AT&T?
(Also corrected the download link in my previous comment anyway).

Yes, you are correct i did flash CSC, not home CSC. Then I reflashed w home CSC but software still says ATT/ATT/ATT.
Moreover on Bootloader screen says "carrier ATT" - I have never seen that before on any Samsung phone that I had. I have no clue how did they lock up device that well. As for removing software via ADB that is not a problem, but ATT locks network selection mode so you cant choose between 5G, LTE, 3G etc..
TMobile in US still supports EDGE and sometimes it comes handy - whereas ATT has only LTE and 5G as they re-farmed EDGE and 3G/HSPA frequencies

h078 said:
Yes, you are correct i did flash CSC, not home CSC. Then I reflashed w home CSC but software still says ATT/ATT/ATT.
Moreover on Bootloader screen says "carrier ATT" - I have never seen that before on any Samsung phone that I had. I have no clue how did they lock up device that well. As for removing software via ADB that is not a problem, but ATT locks network selection mode so you cant choose between 5G, LTE, 3G etc..
TMobile in US still supports EDGE and sometimes it comes handy - whereas ATT has only LTE and 5G as they re-farmed EDGE and 3G/HSPA frequencies
Click to expand...
Click to collapse
I do not get why the CSC can never be changed, even after flashing the complete firmware... must be an ATT thing!
Anyway, to change the csc only, there is another very quick & easy method. It takes only 2/3 minutes; no flash or factory reset is required. You have to download and install a small software "SamFW Tool" on your pc/laptop (may need to disable the antivirus during the download/install process). Once done, connect the phone and enable USB debugging mode. Open the software, under the ADB tab, click Change CSC, from the dropdown list select TMB and click Change. The phone will restart and CSC "Should" change to TMB/TMB/ATT.
Here is the download link for the software:
https://www.mediafire.com/file/upaiwadhmstm6js/SamFwToolSetup_v4.6.zip/file

That did the trick. I have T-Mobile CSC now
Thanks a lot

h078 said:
That did the trick. I have T-Mobile CSC now
Thanks a lot
Click to expand...
Click to collapse
Great!
But still, that's only one part of the final solution I think. Your target was to replace the complete firmware from ATT to TMB, right? Since the CSC is now changed to TMB, I think you can give it another try via ODIN to install the TMB firmware now (only if you want). I am not confident that it will work now, but still, one last try should not be much of a hassle.

I think that these multi CSC contain all US carrier customizations....When I changed it to TMB it shows TMB/TMB/ATT and loads bootlogo as well as TMobile apps... I guess it is similar as Blackberry used to be back in the days...Depending which carrier SIM used it loaded proper settings from the firmware...

I have flash my METROPCS G990U2 to G990U3,other sim card work fine,but t mobile sim card does not work ,can someone help me?I already change CSC to xxa,but still no internet,I do have sginal bar​