Samsung S10 Unlocked phone with AT&T Firmware

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rinku2012

Member
Dec 17, 2015
47
3
Hello.

I have purchased Samsung Galaxy S10 unlocked phone directly from Samsung. I am using At&T carrier network on this phone. As this is the first time, i am purchasing unlocked phone, i was not aware that wifi calling, VOLTE and video calling wont work on unlocked phone ( with AT&T carrier)
There is very poor signal near my home. I really need Wiif calling and VolTE option.
is there a way that i can install At&T firmware on my phone ?

I have few questions after i install the firmware

1. After installing At&T firmware, will other sims work on my phone in future ?
2. I personally paid for the device, but sim is on business account. will this have any impact if i install firmware ?
3. after install AT&T firmware, will i be able to do any future updates without any issues ?
4. will installing this firmware, void my phone warranty ?
5. what is the difference between unlocked and locked phone ( apart from i can use with another careers )

Since this is first time, i have these questions
 
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GuestK00136

Guest
@rinku2012

1. After installing AT&T firmware, will other sims work on my phone in future?

Yes. The Device is unlocked. Installing firmware intended for another Carrier will never lock the device.

2. I personally paid for the device, but sim is on business account. Will this have any impact if I install firmware?

No.

3. After install AT&T firmware, will I be able to do any future updates without any issues?

Yes.

4. Will installing this firmware void my phone warranty?

No.

However if you it take into AT&T for support and they do a check on the IMEI, they'll know it wasn't purchased from them. They'll redirect you to Samsung for assistance.

5. What is the difference between unlocked and locked phone (apart from I can use with another careers)?

An unlocked phone allows you to use SIM cards from other carriers in local or foreign countries.

A locked phone is locked to one carrier in one specific country.
 
Last edited:

rinku2012

Member
Dec 17, 2015
47
3
Hello,
@A_H_E thanks for the message.

Below is the version of the phone

Model Number: SM-G973U1
Baseband version: G973U1UEU1ASBA

can you please guide me/ help me on how to install AT&T firmware on my device
 
G

GuestK00136

Guest
Firmware Instructions

NOTICE (PLEASE READ):

Credit to @iBowToAndroid for the FIRMWARE.

By following these steps, you:

A.) Take sole responsibility for your actions in the event of device failure (e.g., software and/or hardware).

B.) Possess a good understanding of the Windows operating system, the MEGA website, extraction utilities (RAR/7Zip), the installation and use of Odin, Samsung Recovery and its subsequent key combinations and the key combinations required to hard reset your Device or ENTER/EXIT 'Download Mode'. If you do NOT, you will take the necessary steps to familiarize yourself by using XDA SEARCHES and cite your references before requesting assistance.


REQUIREMENTS:

Samsung Android USB Driver:
https://developer.samsung.com/galaxy/others/android-usb-driver-for-windows

Odin:
https://mega.nz/#F!hopmzKIZ!aliq8FsaeK4R8TNb-gJcSw

Carrier Branded Firmware:
https://mega.nz/#F!NpxAHaYI!GuN4tvRtDRjesRwTK7w4kA

USB Type-C Cable

STEPS:

0.) Download and extract both Odin and the AT&T firmware on your PC.

1.) Back-up both your device and your MicroSD card (should you have one inserted).

2.) Remove both SIM and MicroSD card.

3.) Perform a 'Factory Data Reset'
(Settings > General Management > Reset > Factory Data Reset)

4.) After the 'Factory Data Reset' is fully complete, your Device will restart. This is expected behavior.

5.) After the restart, you will be greeted with a 'Let's Go!' page and a prompt to select a language.

6.) Power off the Device.

7.) With the Device powered off, hold down the BIXBY BUTTON and the VOLUME DOWN KEY at the same time.

8.) While still holding down the BIXBY BUTTON and the VOLUME DOWN KEY, press and hold the POWER BUTTON.

9.) When done correctly, you will be greeted with a teal colored screen that reads the following:

'Warning

A custom OS can cause critical problems in phone and installed applications.'

10.) Press the VOLUME UP KEY to enter 'Download Mode'.

11.) Go to the folder where you downloaded and extracted Odin.

12.) Locate and open 'Odin3 v3.13.1.exe'

13.) Click on the BL button. Locate and select the following file:

BL_G973U1UEU1ASBA_CL15445662_QB22243195_REV00_user_low_ship_MULTI_CERT.tar

14.) Click on the AP button. Locate and select the following file:

AP_G973U1UEU1ASBA_CL15445662_QB22243195_REV00_user_low_ship_MULTI_CERT_meta_OS9.tar

15.) Click on the CP button. Locate and select the following file:

CP_G973U1UEU1ASBA_CP12017446_CL15445662_QB22243195_REV00_user_low_ship_MULTI_CERT.tar

16.) Click on the CSC button. Locate and select the following file:

CSC_OMC_OYM_G973U1OYM1ASBA_CL15445662_QB22243195_REV00_user_low_ship_MULTI_CERT.tar.md5

17.) Connect your Device using a USB Type-C cable.

18.) If you've followed all these steps correctly, it will look exactly like '1 - Odin Example.jpg'.

19.) Click on START.

20.) In the top left corner of ODIN, you will see a GREEN progress bar. On your device, you will see a WHITE progress bar.

NOTE: This is normal. New firmware is now being installed.

21.) When the firmware is successfully installed, your Device will restart.

NOTE: Before or after restart, you may or may not see a reference to 'Installing System Update'. This is normal.

22.) After the restart, there will be a pause at the 'SAMSUNG' logo. The operating system is being initialized.

NOTE: You may also see references to 'Installing applications...'. This is normal.

23.) Upon completion, you will again be greeted with a 'Let's Go!' page and a prompt to select a language.

24.) Complete these steps but DO NOT login to your Google/WiFi/Samsung accounts yet. Do NOT insert your SIM.

25.) Skip ALL logins until you get to the 'All done!' page. We need to verify that the firmware installed properly.

26.) After the home screen launches, slide up, locate and click on 'Settings'.

27.) From 'Settings', find and click on 'About Phone'. From 'About Phone', find and click on 'Software Information'.

28.) Under 'Software Information', find 'Service provider SW ver.'.

29.) If successful, you will see 'ATT/ATT/XAA' referenced on the third line.

30.) If this is the case, power off your Device.

31.) Insert your SIM and MicroSD cards, power on the device and set up your Google/WiFi/Samsung accounts.
 
Last edited:

Sakete

Senior Member
Sep 23, 2009
326
148
Hello.

I have purchased Samsung Galaxy S10 unlocked phone directly from Samsung. I am using At&T carrier network on this phone. As this is the first time, i am purchasing unlocked phone, i was not aware that wifi calling, VOLTE and video calling wont work on unlocked phone ( with AT&T carrier)
There is very poor signal near my home. I really need Wiif calling and VolTE option.
is there a way that i can install At&T firmware on my phone ?

I have few questions after i install the firmware

1. After installing At&T firmware, will other sims work on my phone in future ?
2. I personally paid for the device, but sim is on business account. will this have any impact if i install firmware ?
3. after install AT&T firmware, will i be able to do any future updates without any issues ?
4. will installing this firmware, void my phone warranty ?
5. what is the difference between unlocked and locked phone ( apart from i can use with another careers )

Since this is first time, i have these questions

Just so you know, just installing the firmware may not necessarily give you VoLTE or WiFi calling from AT&T. I believe it's also tied to the IMEI of the device, i.e., it needs to be an AT&T branded device. That's why I personally just went for the AT&T version of the S10 as I didn't want that hassle otherwise. And when I do need to use another SIM when traveling abroad, I'll just unlock it through an unlocking service.
 

rinku2012

Member
Dec 17, 2015
47
3
Same steps but you'll use HOME_CSC instead of CSC_OMC.

I forgot to upload that but will shortly.

Thank you. Please upload the file. in another thread i saw that we can only flash userdata file from carrier firmware without having to fully flash the firmware
do we have the user data file ?
 
G

GuestK00136

Guest
Thank you. Please upload the file. in another thread i saw that we can only flash userdata file from carrier firmware without having to fully flash the firmware
do we have the user data file ?

Everything you require is included in my instructions.

But I always recommend a full flash.

I understand having to back-up and restore can be time consuming but it will save you less hassle in the long run.
 
Last edited:

daniel4653

Senior Member
Jul 10, 2010
9,405
2,969
Southern California
Thank you. Please upload the file. in another thread i saw that we can only flash userdata file from carrier firmware without having to fully flash the firmware

do we have the user data file ?
From what I remember you have to flash the correct CSC to update the carrier code. Could be mistaken as i haven't flashed with Odin in about a year.

Sent from my SM-G973U using Tapatalk
 

rinku2012

Member
Dec 17, 2015
47
3
Everything you require is included in my instructions.

But I always recommend a full flash.

I understand having to back-up and restore can be time consuming but it will save you less hassle in the long run.

Thank you. Do we have User data file in the files ?

can you upload HOME_CSC file also
 

rinku2012

Member
Dec 17, 2015
47
3
You don't need USERDATA :)

And yes, like I said before, I will upload HOME_CSC.
.....
It has been uploaded.

'5 - HOME_CSC.7z' is the file name.


Thanks for uploading the file. i got system fail check. below is the message

<ID:1/005> bksecapp.mbn
<ID:1/005> cmnlib.mbn
<ID:1/005> cmnlib64.mbn
<ID:1/005> km4.mbn
<ID:1/005> qupv3fw.elf
<ID:1/005> sec.elf
<ID:1/005> apdp.mbn
<ID:1/005> msadp.mbn
<ID:1/005> storsec.mbn
<ID:1/005> uefi_sec.mbn
<ID:1/005> NON-HLOS.bin
<ID:1/005> multi_image.mbn
<ID:1/005> dspso.bin
<ID:1/005> vbmeta.img
<ID:1/005> vaultkeeper.mbn
<ID:1/005> boot.img
<ID:1/005> recovery.img
<ID:1/005> vendor.img.ext4
<ID:1/005> system.img.ext4
<ID:0/003> Can't open the serial(COM) port.
 
G

GuestK00136

Guest
Let's just focus on getting you back to stock firmware. AT&T can wait until later.

Did you install the USB driver I recommended?
 

rinku2012

Member
Dec 17, 2015
47
3
Let's just focus on getting you back to stock firmware. AT&T can wait until later.

Did you install the USB driver I recommended?

yes i have installed the driver you gave me. when i add home_CSC file its giving me the below message

<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<OSM> All threads completed. (succeed 0 / failed 0)
 
G

GuestK00136

Guest
Nevermind Odin for now.

Please restart the device.

Hold VOLUME DOWN plus POWER for seven seconds.

What happens afterwards?
 

rinku2012

Member
Dec 17, 2015
47
3
Nevermind Odin for now.

Please restart the device.

Hold VOLUME DOWN plus POWER for seven seconds.

What happens afterwards?

i am uploading the stock firmware now. ( i forgot to press volume up to download the firmware. once i clicked on that and pressed start its working)

i will update you in few mins how it goes with stock firmware
 

rinku2012

Member
Dec 17, 2015
47
3
i was able to successfully install stock firmware. but i still see that ATT/ATT/XAA' referenced on the third line
does this mean it dint stocked correctly ?
 

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  • 1
    Hello.

    I have purchased Samsung Galaxy S10 unlocked phone directly from Samsung. I am using At&T carrier network on this phone. As this is the first time, i am purchasing unlocked phone, i was not aware that wifi calling, VOLTE and video calling wont work on unlocked phone ( with AT&T carrier)
    There is very poor signal near my home. I really need Wiif calling and VolTE option.
    is there a way that i can install At&T firmware on my phone ?

    I have few questions after i install the firmware

    1. After installing At&T firmware, will other sims work on my phone in future ?
    2. I personally paid for the device, but sim is on business account. will this have any impact if i install firmware ?
    3. after install AT&T firmware, will i be able to do any future updates without any issues ?
    4. will installing this firmware, void my phone warranty ?
    5. what is the difference between unlocked and locked phone ( apart from i can use with another careers )

    Since this is first time, i have these questions
    1
    NOTICE (PLEASE READ):

    Credit to @iBowToAndroid for the FIRMWARE.

    3.) Perform a 'Factory Data Reset'
    (Settings > General Management > Reset > Factory Data Reset)

    4.) After the 'Factory Data Reset' is fully complete, your Device will restart. This is expected behavior.

    5.) After the restart, you will be greeted with a 'Let's Go!' page and a prompt to select a language.

    6.) Power off the Device.

    7.) With the Device powered off, hold down the BIXBY BUTTON and the VOLUME DOWN KEY at the same time.

    8.) While still holding down the BIXBY BUTTON and the VOLUME DOWN KEY, press and hold the POWER BUTTON.

    9.) When done correctly, you will be greeted with a teal colored screen that reads the following:

    'Warning

    A custom OS can cause critical problems in phone and installed applications.'

    10.) Press the VOLUME UP KEY to enter 'Download Mode'.
    Or... You can just manually boot to recovery, do the wipe there, and then choose Reboot Bootloader to go to Download Mode. Much faster :)

    Same steps but you'll use HOME_CSC instead of CSC_OMC.
    Incorrect.

    You ALWAYS use *non HOME CSC* when switching between U1 and U firmwares
    1
    @iBowToAndroid

    I was under the impression if we go from U1 to U, we use CSC_OMC and HOME_CSC if we go back to U1.
    Nope. HOME leaves data and settings intact, and the other one performs a wipe. A wipe is needed when swapping firmwares since the partition table is slightly different, and even if they were the same, you'd have crashes and glitches and errors galore until you wiped.

    If you merely want to Odin flash a new version of the same firmware instead of doing it OTA, then you can get away with using HOME CSC
    1
    Thanks for clarifying. You provided some insight on a prior thread but this is much more in-depth.

    So, in this Users case, was a full flash of U software needed? Or could we have simply flashed the appropriate Userdata and CSC based on his Carrier of choice (AT&T)?
    1. If you want carrier bloat and/or specific features, then you need U firmware. You can't get any of that with U1

    2. The CSC files are the exact same for any firmwares with the same build - no matter what carrier/region they're from. The only difference is the USERDATA file - that's what contains the bloat.

    3. You can't use USERDATA files when flashing U1
    1
    Let's try with a different Odin.

    I've attached a newer patched version of Odin.
    (Courtesy of this thread: https://forum.xda-developers.com/android/software/patched-odin-3-13-1-t3762572)
    It's not newer. It's just been patched, to remove the incompatibilities that would normally appear. This is the correct version of Odin to use - it can flash pretty much anything, for any model