Develop Bugs

How to identify correct firmware to upgrade - S20+ 5G Snapdragon G986U

Hello -
Guys for last few days i have been trying to install Android 11 OneUI 3.0 update to my S20+ 5G phone. Since i did not receive the update, i was trying to flash it. But i couldnt flash that, in fact, I softbricked my phone in trying so. I will try to explain details here, please guide me to identify the correct firmware to flash.
This phone is unbranded and USA variant, which I bought from someone. I don't have the box but it is unlocked and unbranded phone, any SIM works on it. I tried looking for the CSC and AP version, which I found
AP VERSION G986USQU1ATAW
CSC VERSION G986UOYN1ATAW
I could only find one firmware matching this, which was still Android 10. And it had CSC code = TMB on SamFW website. I was confused what my actual CSC is, i tried looking for with the "Phone Info" app and it mentioned the "Active CSC Code: XAA".
So I tried following firmwares from Samfw.com
Samsung Galaxy S20+ 5G SM-G986U - TMB - G986USQS1CTL1
Samsung Galaxy S20+ 5G SM-G986U - TMB - G986USQU1CTKH
Samsung Galaxy S20+ 5G SM-G986U1 - XAA - G986U1UES1CTL5
Samsung Galaxy S20+ 5G SM-G986U - SPR - G986USQS1CTL1
I couldnt flash with any of the above firmware. It mostly stucked while flashing "super.img", i was using Odin 3.14 patched.
After trying this flashing, my phone was softbricked and i was unable to flash any of the firmware but one thing worked (which i dont know why). I flashed AP, BL and CP with Samsung Galaxy S20+ 5G SM-G986U - TMB - G986USQU1ATAW since it's AP version and CSC was matching exactly same to my previous AP & CSC versions. But this firmware's CSC file was not being flashed to my phone, it was always getting stuck on flashing "prism.img", so i flashed CSC file with Samsung Galaxy S20+ 5G SM-G986U1 - XAA - G986U1UES1BTK1 and the phone thankfully restored back to Android 10. But now my software update section says "Your current software version isn't supported. Visit a service center."
And now after flashing, my CSC version is G986U1OYM1BTK1 which was G986UOYN1ATAW earlier. I read somewhere that in the CSC version when you check from *#1234#, the three letters after your phone model is the CSC code. According to this, for my actual firmware it was OYN i think (G986UOYN1ATAW) and now after flashing it is OYM i think (G986U1OYM1BTK1). I don't see any firmware website mentioning any firmware with this CSC code. I am very confused now, do i not have any updated firmware for my phone or i have been trying wrong firmwares.
I am attaching current screenshots below about current state, Please help me understanding how to get the right firmware version to flash. If anyone has same version and has flashed, please enlighten.
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

To check the original CSC go to Settings, About Phone, Software Information, Service Provider SW ver. On the bottom string the last three letters will be your device’s original CSC Code. Doing a Factory Reset will restore it to the original firmware but be sure to backup your data.
You have a Multi-CSC device. Your best option to receive timely updates is setting the CSC to match your Service Provider. 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 dial, you should see a screen with the list of available CSC codes for your device. Select the CSC for your Service Provider and tap the Install option.
Samsung's Smart Switch platform often times will offer updates before they're available via OTA. Be aware Android 11 One UI 3.0 isn't completely stable, many users are having issues after updating.

So my service Provider SW ver is "XAA/XAA/SPR", which means my CSC code should be SPR. My question is then why this Samsung Galaxy S20+ 5G SM-G986U - SPR - G986USQS1CTL1 did not work? :/ It should have.
Also, why do i see the same AP version and CSC version with this firmware Samsung Galaxy S20+ 5G SM-G986U - TMB - G986USQU1ATAW, whose CSC code looks to be TMB. Its very much confusing.
AP VERSION G986USQU1ATAW
CSC VERSION G986UOYN1ATAW
Plus, this doesn't work in my country i believe. #272*IMEInumber#

So the phone isn't an unbranded device, it's branded by Sprint which is now T-mobile. OTA Updates aren't going to be available unless you're on Sprint/T-Mobile's Network using a Sprint/T-Mobile SIM Card. I'm not sure where you'll find the correct FW for your phone, that's why performing a Factory Reset is going to be the best option to receive OTA's.

Change the csc to xaa and reset the phone and install the software in connection with the patched Odin
Download Samsung Galaxy S20+ SM-G986U1 XAA USA G986U1UES1CTL5 firmware
Fast download latest Samsung Galaxy S20+ firmware SM-G986U1 from USA with G986U1UES1CTL5 and Android version 11
www.sammobile.com

In which country do you use the device and what is the operator name you use?

altiparmak1982 said:
In which country do you use the device and what is the operator name you use?
Click to expand...
Click to collapse
Pakistan, operator is Zong.

kas07 said:
Pakistan, operator is Zong.
Click to expand...
Click to collapse
Since it's a Sprint Branded device there is no FW change will allow you to receive OTA's. The only option is Smart Switch after you do a Factory Reset back to the original Sprint FW. Curious why you aquired a US S20 for use in Pakistan? The Global Exynos variant would have been appropriate if call features and updates are a priority.
altiparmak1982 said:
Change the csc to xaa and reset the phone and install the software in connection with the patched Odin
Download Samsung Galaxy S20+ SM-G986U1 XAA USA G986U1UES1CTL5 firmware
Fast download latest Samsung Galaxy S20+ firmware SM-G986U1 from USA with G986U1UES1CTL5 and Android version 11
www.sammobile.com
Click to expand...
Click to collapse
The Original CSC can't be modified, it will remain SPR. This FW is for a US Unbranded device, it won't receive OTA's for a Sprint Branded phone. Since the user is in Pakistan and not on Sprint's Network or using a Sprint SIM the only option is downloading updates via Smart Switch after the original FW is restored by Factory Resetting the device.

Well i acquired it because it had snapdragon and 12GB RAM unlike the global exynos version and its not branded, there's no logo and its totally unlocked. So i didnt have any idea it will have Sprint FW.
SmartSwitch doesnt show any update. And now even my phone says "Your current software version isn't supported. Visit a service center."

altiparmak1982 said:
Change the csc to xaa and reset the phone and install the software in connection with the patched Odin
Download Samsung Galaxy S20+ SM-G986U1 XAA USA G986U1UES1CTL5 firmware
Fast download latest Samsung Galaxy S20+ firmware SM-G986U1 from USA with G986U1UES1CTL5 and Android version 11
www.sammobile.com
Click to expand...
Click to collapse
I already have tried flashing with this firmware it dint work. But i didn't change CSC before trying, is it changeable?

Since the original CSC is SPR it is a Sprint Branded device even though it may be unlocked. Updates are pushed by Samsung for specific devices based on the device's Original CSC, not the Active CSC. The only way you'll receive updates is via Smart Switch with the phone connected to a PC, Laptop or Tablet after you've installed the Sprint FW.
Not sure how valuable the update will be to you since it's structured for Sprint but either way you might consider holding off on Android 11 OneUl 3.0, it's not yet a stable version. Many of the recent posts here are S20 users who've developed issues after installing the 3.0 update.

varcor said:
Since the original CSC is SPR it is a Sprint Branded device even though it may be unlocked. Updates are pushed by Samsung for specific devices based on the device's Original CSC, not the Active CSC. The only way you'll receive updates is via Smart Switch with the phone connected to a PC, Laptop or Tablet after you've installed the Sprint FW.
Not sure how valuable the update will be to you since it's structured for Sprint but either way you might consider holding off on Android 11 OneUl 3.0, it's not yet a stable version. Many of the recent posts here are S20 users who've developed issues after installing the 3.0 update.
Click to expand...
Click to collapse
I suggested such a way because the user says xaa for csc. I agree with what you said except that if the SPR software burns, will the SPR not ask for the sim card at startup?

altiparmak1982 said:
I suggested such a way because the user says xaa for csc. I agree with what you said except that if the SPR software burns, will the SPR not ask for the sim card at startup?
Click to expand...
Click to collapse
Can't say but typically a SIM isn't required to setup a Galaxy device. The real problem is the user wants updates for a device which is operating outside of it's native region. Many users who opted for the Snapdragon SoC to avoid a Exynos variant are having the same issues. The Sprint CSC is in conflict with his region.
The Active CSC can be changed to function in Pakistan but it can't be updated. I've explained the only method to update the device in his/her region but to what benefit? If a user has a priority for updates and call features the best bet is always acquiring their Service Provider's device. Samsung is the real culprit here by using competing chipsets on the same model numbered devices.

varcor said:
To check the original CSC go to Settings, About Phone, Software Information, Service Provider SW ver. On the bottom string the last three letters will be your device’s original CSC Code. Doing a Factory Reset will restore it to the original firmware but be sure to backup your data.
You have a Multi-CSC device. Your best option to receive timely updates is setting the CSC to match your Service Provider. 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 dial, you should see a screen with the list of available CSC codes for your device. Select the CSC for your Service Provider and tap the Install option.
Samsung's Smart Switch platform often times will offer updates before they're available via OTA. Be aware Android 11 One UI 3.0 isn't completely stable, many users are having issues after updating.
Click to expand...
Click to collapse
Hello sir I have S20+ 5g Canadian, g986w Snapdragon model, nd I'm frm India I want to change csc of Indian but there is no options for INS/INU , there is only 8,10 csc option how can I change to indian ??? Plssss help TIA... Yeahhh I also downgraded it to android 10 oneui 2.5

Finally upgraded my Samsung Galaxy S20+ Snapdragon SM-G986U to ANDROID 11, ONE UI 3.1
After getting failed in failing many of the ROMs earlier, I tried latest android 11 of 1 June, 2021 build of CSC "XAS" and model "G986U" and flashed only AP, BL & CP file. Didn't flash the CSC file, CSC file was still the older, which worked after last soft-bricked (CSC: SM-G986U1 - XAA - G986U1UES1BTK1)
CSC - XAS: https://samfw.com/firmware/SM-G986U/XAS/G986USQS2DUE2
(Please read earlier comments for context)

kas07 said:
Finally upgraded my Samsung Galaxy S20+ Snapdragon SM-G986U to ANDROID 11, ONE UI 3.1
After getting failed in failing many of the ROMs earlier, I tried latest android 11 of 1 June, 2021 build of CSC "XAS" and model "G986U" and flashed only AP, BL & CP file. Didn't flash the CSC file, CSC file was still the older, which worked after last soft-bricked (CSC: SM-G986U1 - XAA - G986U1UES1BTK1)
CSC - XAS: https://samfw.com/firmware/SM-G986U/XAS/G986USQS2DUE2
(Please read earlier comments for context)
Click to expand...
Click to collapse
Hey, I have a similar issue and I live in the same country, I got a unlocked Samsung s20+ 5g snapdragon variant and I have already done factory reset but it doesn't show any updates in the settings it just says "Your current software version isn't supported." and it says software is latest version in smart switch.
My CSC is a bit different than yours: XAA/XAA/WWD
I have attached the smart switch pic, can anyone help me update the phone to the latest version?
Also a question to kas07, was your phone official pta approved or cpid?

Question Need help to Convert SM-F936U/DS ATT Fold 4 to Indian Fold 4 version?

So I am using AT&T version Zfold 4 model SM-F936U/DS in India and my software version is as follows:
Build number
SP2A.220305.013.F936USQU1AVGA
Service provider software version
SAOMC_SM-F936U_OYN_GCF_12_0003
GCF/GCF.GCF/XAA
Its stuck on android 12 May update.
I want to flash Indian firmware to make it Indian version of Z fold 4 for faster updates and enabling the call recorder.
What do I need to do? Any help will be appreciated. If this is answered anywhere please provide links to that thread and I will delete this one.
I am totally confused about CSC, firmware version, carrier version etc.

Not gonna happen without root, even then might be difficult.
The Indian model is a F936B model. Trying to flash the firmware on it is like trying to flash IOS on an android.
Did see a way to change CSC in the forum however I believe you needed to have the compatible variant as it needed the OXM ROM flashed 1st.

ultramag69 said:
Not gonna happen without root, even then might be difficult.
The Indian model is a F936B model. Trying to flash the firmware on it is like trying to flash IOS on an android.
Did see a way to change CSC in the forum however I believe you needed to have the compatible variant as it needed the OXM ROM flashed 1st.
Click to expand...
Click to collapse
Thanks for the reply. I am browsing the forums for a solution and so far have got nothing. I don't want to root the device as of now.

ultramag69 said:
Not gonna happen without root, even then might be difficult.
The Indian model is a F936B model. Trying to flash the firmware on it is like trying to flash IOS on an android.
Did see a way to change CSC in the forum however I believe you needed to have the compatible variant as it needed the OXM ROM flashed 1st.
Click to expand...
Click to collapse
Hii have a zfold f936b bought from eBay.
It says IMEI is 00000000 and when I insert sim nothing happens.
Any idea what are my options ?

Adv.Chirag said:
So I am using AT&T version Zfold 4 model SM-F936U/DS in India and my software version is as follows:
Build number
SP2A.220305.013.F936USQU1AVGA
Service provider software version
SAOMC_SM-F936U_OYN_GCF_12_0003
GCF/GCF.GCF/XAA
Its stuck on android 12 May update.
I want to flash Indian firmware to make it Indian version of Z fold 4 for faster updates and enabling the call recorder.
What do I need to do? Any help will be appreciated. If this is answered anywhere please provide links to that thread and I will delete this one.
I am totally confused about CSC, firmware version, carrier version etc.
Click to expand...
Click to collapse
Your phone, F936U, is carrier locked to the U.S. network, AT&T, and if genuine, can only receive updates when connected on their network as unlike other models, AT&T issue their own firmware updates.
This model also has a locked bootloader which prevents the flashing of alternative stock firmware.
Also, it seems strange that a phone that was only launched in August 2022 would have a, "May", update. Install DevCheck, free from the Play Store and check if you have a clone phone.

Emmanuel Spadafora said:
Hii have a zfold f936b bought from eBay.
It says IMEI is 00000000 and when I insert sim nothing happens.
Any idea what are my options ?
Click to expand...
Click to collapse
The phones efs/file is corrupt. See...
What is EFS folder ?
Hi All, I came to know the EFS folder is very important in Samsung phones. I didn't cared about it and flashed a different region ROM (XEU->OZS). Each thing is working fine. I can remember that there used to be some files inside the EFS folder...
forum.xda-developers.com
I have never been able to repair an efs/file but here is a link to someone who claims to have done so...
[GUIDE] how to fix EFS Damaged on samsung devices [EASY!]
Edited in 2022 to make it look a bit better! *WARNING* *TAKE A NANDROID BACKUP OF EFS AND BASEBAND BEFORE STARTING* Hello people, first I want to say that this is my first guide so it doesn't really look professional but I am doing my best to...
forum.xda-developers.com

[email protected] said:
Your phone, F936U, is carrier locked to the U.S. network, AT&T, and if genuine, can only receive updates when connected on their network as unlike other models, AT&T issue their own firmware updates.
This model also has a locked bootloader which prevents the flashing of alternative stock firmware.
Also, it seems strange that a phone that was only launched in August 2022 would have a, "May", update. Install DevCheck, free from the Play Store and check if you have a clone phone.
Click to expand...
Click to collapse
I got it carrier unlocked. Everything works fine in India with major carriers, even getting 5G to work here. Attaching screenshots of DevCheck
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

Adv.Chirag said:
I got it carrier unlocked. Everything works fine in India with major carriers, even getting 5G to work here. Attaching screenshots of DevCheck
View attachment 5789875View attachment 5789881
Click to expand...
Click to collapse
Seems genuine. Your mention of a May update threw me.
It is running the F936USQU1AVGA firmware which it was launched with and therefore, has never received an update.
However, it is still a bootloader locked model, even though you have it carrier unlocked. The only way to update it is to insert an AT&T SIM card and connect to their network in the US. Other than that, you will need to do a search to see if there are any custom ROM's that utilises the locked AT&T bootloader. Alternatively, just carry on using it as it is

[email protected] said:
Seems genuine. Your mention of a May update threw me.
It is running the F936USQU1AVGA firmware which it was launched with and therefore, has never received an update.
However, it is still a bootloader locked model, even though you have it carrier unlocked. The only way to update it is to insert an AT&T SIM card and connect to their network in the US. Other than that, you will need to do a search to see if there are any custom ROM's that utilises the locked AT&T bootloader. Alternatively, just carry on using it as it is
Click to expand...
Click to collapse
Thanks for clearing these things for me. I appreciate it.

No experience with AT&T but if they release their firmware online then you should be able to download & flash latest using ODIN.
Good Luck....

ultramag69 said:
No experience with AT&T but if they release their firmware online then you should be able to download & flash latest using ODIN.
Good Luck....
Click to expand...
Click to collapse
Thanks

i dont think its possible, India phone comes with 2 physical sim slots or an esim option for the second sim where as the AT&T which you and I have, comes only with single physical sim.

Adv.Chirag said:
So I am using AT&T version Zfold 4 model SM-F936U/DS in India and my software version is as follows:
Build number
SP2A.220305.013.F936USQU1AVGA
Service provider software version
SAOMC_SM-F936U_OYN_GCF_12_0003
GCF/GCF.GCF/XAA
Its stuck on android 12 May update.
I want to flash Indian firmware to make it Indian version of Z fold 4 for faster updates and enabling the call recorder.
What do I need to do? Any help will be appreciated. If this is answered anywhere please provide links to that thread and I will delete this one.
I am totally confused about CSC, firmware version, carrier version etc.
Click to expand...
Click to collapse
Hi Chirag,
were you able to update your phone? I have the same model(SM-F936U/DS) and stuck with an old update and no new updates show up even though Andriod 13 has been rolled out for the Indian variants.
if there is no possibility of updating the phone then I might consider selling it! any help woud be appreciated.

chakraa2 said:
Hi Chirag,
were you able to update your phone? I have the same model(SM-F936U/DS) and stuck with an old update and no new updates show up even though Andriod 13 has been rolled out for the Indian variants.
if there is no possibility of updating the phone then I might consider selling it! any help woud be appreciated.
Click to expand...
Click to collapse
There is no way I could find online to get the updates. Nothing works. The only way is to have US sim and be connected to AT&T network in US to get the update which is impossible. So I guess we are stuck with the old os version.

Adv.Chirag said:
There is no way I could find online to get the updates. Nothing works. The only way is to have US sim and be connected to AT&T network in US to get the update which is impossible. So I guess we are stuck with the old os version.
Click to expand...
Click to collapse
Hi Chirag,
Thanks for the revert. Thats a bummer that we can't do anything with the update. I can still make my peace with the slow updates but having no updates especially the security updates is very concerning.
I will keep you posted in case I happen to come across any solution to this.
Regards,
Amit.

Adv.Chirag said:
I got it carrier unlocked. Everything works fine in India with major carriers, even getting 5G to work here. Attaching screenshots of DevCheck
View attachment 5789875View attachment 5789881
Click to expand...
Click to collapse
may I ask how you able to unlock it? Who did you go to?

I would say just start going through the different csc that's how I got mine to show the new up date then I just went back to gfc
Adv.Chirag said:
There is no way I could find online to get the updates. Nothing works. The only way is to have US sim and be connected to AT&T network in US to get the update which is impossible. So I guess we are stuck with the old os version.
Click to expand...
Click to collapse
I would say just start changing csc until it comes up that's how I got mine to show then January update and then I went back to GFC

shorty9210 said:
I would say just start going through the different csc that's how I got mine to show the new up date then I just went back to gfc
I would say just start changing csc until it comes up that's how I got mine to show then January update and then I went back to GFC
Click to expand...
Click to collapse
Hi, Do you mind listing out the csc version that you used? Also any tips on how to flash it would be appreciated . The lack of software update is really driving me nuts man.

Adv.Chirag said:
There is no way I could find online to get the updates. Nothing works. The only way is to have US sim and be connected to AT&T network in US to get the update which is impossible. So I guess we are stuck with the old os version.
Click to expand...
Click to collapse
Hi Chirag,
I can confirm the method mentioned shorty9210 indeed works! I just changed the CSC to T-Mob and the updates have started flowing. Just use the samFw.com tool to change the CSC, you will get T-MOB logo once you have changed the CSC but the updates will come by. It didnt delete the data too. Couldnt be any happier!
Give it a shot!
Cheers,
Amit.

shorty9210 said:
I would say just start going through the different csc that's how I got mine to show the new up date then I just went back to gfc
I would say just start changing csc until it comes up that's how I got mine to show then January update and then I went back to GFC
Click to expand...
Click to collapse
you are a life saver sir! Thanks so much! I changed the csc to T-Mob and the updates are flowing! A quick question though do we need to change back and forth to GFC everytime theres an update? For now mine is at T-MOB.

Question Changing CSC for free using SamFW Tool | No Root required! - A brief guide!

As the title suggests, I was able to successfully change the CSC on my factory unlocked (unbranded) Fold 3 - F926B/DS bought in Germany with OXM firmware having Android 13 & one UI 5.0 from EUX to INU csc using SamFW Tool v3.31 in hardly 2-3 mins. Kindly note that I also looked into other options to do this like Samkey tool (paid service) and alliance shield app (which doesn't work anymore) etc before engaging with the SamFW Tool as none were simple/working with no complications whatsoever involved.
My main objective to change the CSC was to enable call recording and couple of other features (including some pleasant surprises listed in the end of the post) which were available in the INU csc with little to no hassle. The process was pretty simple, straight forward and most importantly, FREE . It DOESN'T require any factory reset, flashing of roms or wiping cache partition before or after the process.
The step by step guide process which worked for me is as follows:
STEP 1: Click here - SamFW Tool Download - to download the latest version of SamFW tool.
STEP 2: Remove the sim card and connect your phone to a computer and make sure the phone's drivers are installed.
STEP 3: Unzip the downloaded file. Right click on the file SamFwFRPTool.exe and 'Run as Administrator'.
STEP 4: After the software opens, make sure your phone is detected before proceeding. If its detected, click on ADB tab in the software.
STEP 5: In your phone, go to developer options and enable 'usb debugging'.
STEP 6: In your phone, open phone dialer and type *#0*# to get into test mode. Leave the phone unlocked and keep it aside now.
STEP 7: Click on 'Change CSC' button in the ADB tab of the tool. Now the tool will connect to your phone, check and list the available CSCs which your phone model supports as shown in the pic attached.
STEP 8: Choose a CSC which you wish to change to from the drop down menu in the pop-up window as shown in the pic attached.
NOTE: The tool also has the option to force the phone to accept a CSC not listed/supported as well by manually entering the same. However, I would not recommend doing it if you really wish to get OTA updates and also to evade any unforeseen issues. I must admit, I haven't frankly tried this and do not know what lies in the pandora box to be honest.
STEP 9: After choosing the CSC from the drop down, the tool quickly connects to the phone, changes the CSC and restarts the phone.
STEP 10: After the phone restarts, unlock the phone using your pin/password, insert your simcard, check the change of CSC in software information, disconnect the phone from the computer and also disable the 'usb debugging' in the developer options.
That's it! All done. Phone restarts with the new chosen CSC and the related features will now be active!
BONUS: There is also an option in the ADB tab in the SamFW Tool named 'Battery information' which gives the complete information of the battery status including the 'charge/discharge cycles' along with its temperature, voltage etc. like in the pic attached. Do note that the information shown in the 'Genuine battery' section isn't correct for some reason and always shows as 'NO' for any phone with/without genuine battery.
With my choice of INU csc the following major changes/surprises were noticed over the EUX:
1. Call recording and a couple of other INU specific features are now enabled (google for more info on what csc enables what features).
2. Not sure why but Battery backup has increased significantly after the csc change to INU. SOT (Screen On Time) which has fallen to 3-4 hrs after the OTA update to One Ui 5.0 & Android 13 is now back to 5-7hrs or more.
3. RAM management has definitely got better. With EUX csc it used be around 5-6GB during standby and now its always around 3-4GB when the phone is idle.
4. Instead of 4G or 4G+, now it shows LTE and LTE+.
5. Mobile data speed has increased both in 5G (Jio True5G network) and in LTE+ when compared to EUX CSC.
6. 5G signal strength has improved drastically. Signal loss or switching to 4G+/LTE+ is very low now.
7. 5G to 4G/LTE switching while calls (VoLTE/VoNR) is more seamless now. Latching back onto 5G network after a call is a breeze now unlike earlier with EUX csc.
8. Phone definitely got faster for some reason. Can very much feel the difference when switching between apps, multi-tasking, even opening/closing apps and other day-to-day tasks.
etc...
Haven't tested whether the OTA updates will still get pushed after the change in CSC yet, as my phone is already updated to the latest patch as I write this. Should absolutely work IMO as long as we choose a CSC which the phone supports but in any case will update the thread once the next update via OTA is available/pushed by Samsung.
Disclaimer: Please be informed that all the above information is purely based on experience of using the tool for changing CSC only which worked well for me with my Fold 3. Cannot take responsibility if it doesn't work for you.

Does it work for Fold 4. Want to change CSC from Korean Region to INU (India). Please guide

Sorry, haven't tried it on Fold 4. Logically it shud work, I guess. There is no harm in connecting n checking what CSCs does ur model supports using the tool IMO.

Tried out but it does not work. It shows only the Korean csc. Even that seems to be not changing

Oh k. I think the tool works, else u wudnt b seeing the CSC which ur phone supports.
I have checked sources in the web as well on this and looks like Fold 3 or 4 with Korean CSC supports only CSC from Korea.
I guess u can still force a CSC on to it replacing the Korean one but thats too risky as u will b missing OTA updates and im not aure wat all things it will mess up.

Awesome! It works and it doesn't wipe the device. I just switched from G975U VZW to CCT without any issues.

BlueTR said:
Awesome! It works and it doesn't wipe the device. I just switched from G975U VZW to CCT without any issues.
Click to expand...
Click to collapse
Happy to hear that. BTW I also got samsung pay/wallet to work as well by installing its apk file today after changing the system language to a local one specific to the changed CSC i.e., English (India) for INU CSC in my case.

I confirm that it is working on a stock android 13! Great tool!
(It worked on the second try though )

Has anyone tired it on a Fold 4, Mine is XAA and I want to convert it to INU. Haven't been abe to do it as yet.
Let me know if someone finds a way, mine is a US version and I want to convert it to the India CSU.
Thanks in advance

unexpected0ne said:
I confirm that it is working on a stock android 13! Great tool!
(It worked on the second try though )
Click to expand...
Click to collapse
Good to know! Just out of curiosity, u tried this on a Fold 3 or Fold 4?

srikanth.addala said:
Good to know! Just out of curiosity, u tried this on a Fold 3 or Fold 4?
Click to expand...
Click to collapse
Fold 3, latest official android 13

unexpected0ne said:
Fold 3, latest official android 13
Click to expand...
Click to collapse
Oh great. Getting otas after the change?

Does OTA work after change?

Hello, can somebody please briefly summerise the options for switching the CSC/Firmware?
I read other threads and this one and now am confused which method actually would work for me.
My situation: i have a Samsung A52s 5G purchased from Deutsche Telekom in Germany, sold separately, not bundled with a contract.
And i am having a contract with a different carrier on a different network, but a german SIM card.
My phone is configured all english, and i need to keep that.
Because of assumed network optimisations and the problem of delayed updates of "branded" phones, i would like to convert the phone from the current CSC of DTM to the DBT using fimrware (A528BXXS1DVL2/A528BOXM1DVK5/A528BXXU1DVK5/A528BXXS1DVL2), which i hope would link me to updates directly provided by Samsung.
I found "https://forum.xda-developers.com/t/...official-firmware-all-samsung-device.2697238/" and "https://forum.xda-developers.com/t/...-multi-csc-codes.4436853/page-5#post-87485577 ", but i am not sure whther the methods described there only apply for UPDATING (within the same CSC) the phone with non-OTA methods, or whether that also covers SWITCHING the CSC?
In the end i have two questions:
1) So far i believed that "simply" putting an official stock Samsung firmware (multi CSC in my case, containing the DBT, but apparently NOT containing the DTM) would bring me there.
But then i read that this might not be suffficient. Instead i also would have to switch the CSC in my Phone's config, which apparently would require purchasing a license for a Samkey unlock code.
Because otherwise i would not receive any OTA updates once i switched just the firmware.
Is that actually true?
I would prefer not to have to buy a Samkey...
And to make the confusion even bigger: now i read, SamFw Tool would also be an option?
But: is that trustworthy? And: from posts of some of you: this might even obsolete to switch the firmware, do i understand that right?
2) If switching firmware still is required: would using Odin/Heimdall be the only option to switch the firmware, or would adb sideloading do the same job as well? I am asking because i don't have access to a windows machine.
Would be so great if someone of you could untangle my confusion a bit, thank you.

MarkoParkovic said:
Does OTA work after change?
Click to expand...
Click to collapse
Did not automatically receive the OTA updates with the recent DVL9 update. However, tried a work around to change the CSC back to EUX via the same tool (which is a 2 min task) to check if I can get OTA again.
And yes it worked! immediately after changing the OTA to its home CSC, was able to see OTA in the updates section of the phone. So, I updated the phone to the latest version (DVL9) and then changed the CSC back to INU after the update . All is well and quick! .

very nice i changed sfr to tur but netflix and always on display app not shown google play so unsupported why idk

burc ugur said:
very nice i changed sfr to tur but netflix and always on display app not shown google play so unsupported why idk
Click to expand...
Click to collapse
May be TUR csc has restricted options/features. In my example after I changed to INU csc (India one) all the India related options got automatically activated like call recording, spam filter, samsung pay using cards etc etc. which weren't available with the EUX csc before the change.

srikanth.addala said:
May be TUR csc has restricted options/features. In my example after I changed to INU csc (India one) all the India related options got automatically activated like call recording, spam filter, samsung pay using cards etc etc. which weren't available with the EUX csc before the change.
Click to expand...
Click to collapse
Any potential issues using INU csc in the UK? I use Samsung pay already but native call recoding would be really useful for me

srikanth.addala said:
May be TUR csc has restricted options/features. In my example after I changed to INU csc (India one) all the India related options got automatically activated like call recording, spam filter, samsung pay using cards etc etc. which weren't available with the EUX csc before the change.
Click to expand...
Click to collapse
edit: excuse me you have play protect certificate? i changed csc samfw topl but now i don't have play protect certificate. Therefore not shown Netflix.
you have this? if you have how can i fix certificate.

burc ugur said:
edit: excuse me you have play protect certificate? i changed csc samfw topl but now i don't have play protect certificate. Therefore not shown Netflix.
you have this? if you have how can i fix certificate.
Click to expand...
Click to collapse
Might be worth clearing cache and data from Google play services see if that helps. Having the same device with 2 different cscs might have confused Google
Edit
Any reason your Google play store is out of date or is it connected to your original issue

How To Guide How to Enable All Bands Through Service Menu on ALL International Snapdragon Samsung S20/S21/S22/Fold2/Fold3/Fold4+ series (including 4G LTE, 5G NR)

Background​Previous methods have only worked on US and Canada phones due to the dialer code only working on US/Canada phones on U and U1 firmware, and also the presence of IOTHiddenMenu on those devices' firmware. However, thanks to @K0mraid3's successful resurrection of the System Shell exploit, the Service Menu method can now be applied to International Snapdragon phones as well.
This means, any international Samsung S20/S21/S22/Fold2/Fold3/Fold4/... with Snapdragon processors, including but not limited to G9880, G988N, G9980, S908E, F936B...
The method used in this post is to directly launch the Service Menu by invoking the Service Mode RIL directly and bypass the need for IOTHiddenMenu or equivalent dialer codes. I found this specific command by decompiling Service Mode RIL APK and tracing through its AndroidManifest and BroadcastReceiver implementation.
How to (new method)​1. Download Samsung Toolkit app onto your phone
2. Follow the instructions for running the app.
3. Use the Service Menu option in the app and follow from #5 in the below instructions
How to (original)​1. Obtain System Shell access on your phone by following the instructions in @K0mraid3 's System Shell Exploit thread.
2. In the newly-opened System Shell, copy and paste the following command,
Code:
am broadcast -a com.samsung.android.action.SECRET_CODE -d android_secret_code://27663368378 -n com.sec.android.RilServiceModeApp/.SecKeyStringBroadcastReceiver
Ensure the entire command is copied correctly.
3. Run the command.
4. You should now see the Service Menu appear on the phone.
5. Follow instructions for Method 2 in the original How to unlock bands thread.
6. Follow instructions for Method 1 in the original How to unlock bands thread.
7. Now all bands, both 4G LTE and 5G NR that the hardware is capable of, are unlocked.
Proof​I got my hands on a Korean model S20 Ultra (G988N) which has a Snapdragon CPU. Out of the box, it ONLY supports 5G NR n78. After doing the above steps, it now supports n5, n77, n78.
Before After
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
Bonus​On certain international phones *#0011# or *#2263# don't work the way you expect them to. But with the service menu, you can access the same exact ones as the US models through the service menu (RF Test -> Band Selection to replace 2263, and Protocol State ->Basic Information to replace 0011)
In the case of the Korean phone, 2263 did not work at all. But 0011 brought up a totally different looking screen than the US version did.
Limitations​For Exynos models owners - sorry, you're out of luck for now. I haven't been able to find a single menu that helps unlock bands on those models. The menus that open are VERY different and limited in functionality. Unfortunately, that's just how Samsung made it.
While "Disable CA Combos" is enabled by forcing GCF, it does not overcome hardware supported CA combos. So using a US SIM on the Korean phone for example, will still refuse to engage Carrier Aggregation on US carriers' bands.
Credits​@K0mraid3 for the System Shell exploit
@peacey8 / @wr3cckl3ss1 / @bigdave79 for the Band Unlocking instructions on US/CA models

Respect!
Is there a way to check the activated bands before going through all the steps?
With *#0011# on my SM-9010 (S22 SD), I can see that my phone uses n28 here.

Swaddy said:
Respect!
Is there a way to check the activated bands before going through all the steps?
With *#0011# on my SM-9010 (S22 SD), I can see that my phone uses n28 here.
Click to expand...
Click to collapse
Yes you can check the current available bands by going into the Service Menu and RF Test, Band Selection

I would love to find a way to get this to work on Exynos chips. I have the intl S21+ and while I do have a 5G band for Tmobile in USA, I just can't ever connect to it.

You Sir, might just be a legend. I've got the Japanese Olympic Edition of the S21 here and never got to use the full potential of it here in Europe because of its limited band compatibility.
All other methods I tried so far didn't work, so I was just about to sell it- when I found this thread by accident. I'll give it a shot tomorrow.
Any idea if this change is persistent or will it be reset after an update?

Murdock80 said:
You Sir, might just be a legend. I've got the Japanese Olympic Edition of the S21 here and never got to use the full potential of it here in Europe because of its limited band compatibility.
All other methods I tried so far didn't work, so I was just about to sell it- when I found this thread by accident. I'll give it a shot tomorrow.
Any idea if this change is persistent or will it be reset after an update?
Click to expand...
Click to collapse
It's persistent, until a CSC change or a firmware update that makes changes to the CSC.

rayw_xda said:
It's persistent, until a CSC change or a firmware update that makes changes to the CSC.
Click to expand...
Click to collapse
Thanks mate, I seemingly got it to work up to (and including) Step 5 of your description.
Just to avoid a misunderstanding: Do you suggest to go through Method 2 AND then Method 1 of the "How to unlock bands" thread or is one of them sufficient?
Edit:
Proceeded with Method 2, then 1. All Bands enabled, verified via Band selection menu.
Awesome!
Can I buy you a beer?

Murdock80 said:
Thanks mate, I seemingly got it to work up to (and including) Step 5 of your description.
Just to avoid a misunderstanding: Do you suggest to go through Method 2 AND then Method 1 of the "How to unlock bands" thread or is one of them sufficient?
Edit:
Proceeded with Method 2, then 1. All Bands enabled, verified via Band selection menu.
Awesome!
Can I buy you a beer?
Click to expand...
Click to collapse
Glad it worked for you!
Beer would be appreciated too . My signature has links for that if you'd like

Any way to get *#73# back for Verzion and T-Mobile etc? Since at least the Jan 1, 2023 update, the the SamFW FRP tool, go to MTP tab and click on "Enable Secret Code for Verizon" no longer works on the S21 Ultra (SM-G998U1).

Can you PLEASE determine if this same command works on the S23U to launch the Service Menu, or what steps are needed to find out?
Now that Snapdragon is being used across all regions, I think this will be huge for US customers who want an unlocked bootloader if they can easily purchase an EU S23U and enable all bands with this method!

bdvince said:
Can you PLEASE determine if this same command works on the S23U to launch the Service Menu, or what steps are needed to find out?
Now that Snapdragon is being used across all regions, I think this will be huge for US customers who want an unlocked bootloader if they can easily purchase an EU S23U and enable all bands with this method!
Click to expand...
Click to collapse
If you buy me an S23 then sure

dyeager said:
Any way to get *#73# back for Verzion and T-Mobile etc? Since at least the Jan 1, 2023 update, the the SamFW FRP tool, go to MTP tab and click on "Enable Secret Code for Verizon" no longer works on the S21 Ultra (SM-G998U1).
Click to expand...
Click to collapse
There's this alternative method:
https://www.reddit.com/r/samsung/comments/ybpnng
If that still doesn't work, here's a surefire way that works,
https://www.reddit.com/r/samsung/comments/10zdhv1

bdvince said:
Can you PLEASE determine if this same command works on the S23U to launch the Service Menu, or what steps are needed to find out?
Now that Snapdragon is being used across all regions, I think this will be huge for US customers who want an unlocked bootloader if they can easily purchase an EU S23U and enable all bands with this method!
Click to expand...
Click to collapse
There's now an easier method to find out (without a PC, or USB cable),
https://www.reddit.com/r/samsung/comments/10zdhv1

rayw_xda said:
There's now an easier method to find out (without a PC, or USB cable),
https://www.reddit.com/r/samsung/comments/10zdhv1
Click to expand...
Click to collapse
I don't have an S23 yet but I'm trying to get S23 users to confirm they can launch the service menu/access band selection.
I see welshkiwi95 from that reddit stated he couldn't get Shizuku to work due to a VERSION_LOCKED message. For users that already have rooted their phones they wouldn't need a system level shell, wouldn't this be circumvented?

bdvince said:
I don't have an S23 yet but I'm trying to get S23 users to confirm they can launch the service menu/access band selection.
I see welshkiwi95 from that reddit stated he couldn't get Shizuku to work due to a VERSION_LOCKED message. For users that already have rooted their phones they wouldn't need a system level shell, wouldn't this be circumvented?
Click to expand...
Click to collapse
Welshkiwi95 is also me (also am not a he ).
I have been able to change my carrier vanity name but it also doesn't work at the same time. Very much thinking we need a new exploit or root. Because as I said in another thread, could be a OneUI issue or a S23 series issue.

Thank you, I've successfully unlocked China 5G bands on 908N with Korean LUC carrier.

Dear All Members,
I'm trying to see if anyone has successfully unlock all the respective LTE Bands for the G998UZKAWZW. I'm currently using the phone in Malaysia on a Malaysian Telco Provider and require the LTE Band 28 to be enabled and following the instructions did not yield any results in enabling the LTE Roaming Bands .
Hope to get some guidance from someone who has managed to enable all the LTE Bands

Neomorpheus8988 said:
Dear All Members,
I'm trying to see if anyone has successfully unlock all the respective LTE Bands for the G998UZKAWZW. I'm currently using the phone in Malaysia on a Malaysian Telco Provider and require the LTE Band 28 to be enabled and following the instructions did not yield any results in enabling the LTE Roaming Bands .
Hope to get some guidance from someone who has managed to enable all the LTE Bands
View attachment 5844895
Click to expand...
Click to collapse
convert your firmware to U1 then follow this https://forum.xda-developers.com/t/...22-series-including-sub-6-and-mmwave.4488435/

deleted

I am on Korean Lg U+, and if i change the CSC to GCF, the Service does not work. How do i fix it?

How to downgrade to OneUI 5.0?

Hi. Guys I have updated my S20 Ultra G-988B/DS to OneUI 5.1 and then lost Physical sim option for 2nd sim, before both sim slots were working fine. How to downgrade back to OneUI 5.0 regain my 2nd Physical sim option.?
Thanks a lot

@alich3451 iirc you might be able get the firmware and use Odin to flash it (I've done it before to a galaxy tab s2). What country are you in (to get the right firmware?)
I’ll make a video on how to do this in a sec…..

Here's the video (I made it right now - OneDrive link because XDA kept giving me upload errors):
https://1drv.ms/v/s!AkBuD6XsET8xgZVwRWKwdlDtVqJsIw?e=vegtvU
Links mentioned in video:
Samsung USB Driver (install before starting): https://developer.samsung.com/android-usb-driver
Odin: https://forum.xda-developers.com/t/patched-odin-3-13-1.3762572/
Firmware (says BTU but downloads as OXM international for all phones for some reason - use "direct download link"): https://galaxyfirmware.com/model/SM-G988B/BTU/G988BXXSFGVK1