I inserted AT&T SIM and now my phone is with AT&T - General Questions and Answers

Hello everyone!
Today I did a very stupid thing on my S10.
I found an AT&T sim card on my house becouse my parent bought an iphone 12 pro max on a trip on USA and the phone had this AT&T sim card. I inserted it asked my to restart my phone and now I have every app of AT&T and my mobile data button is not located on the notification panel anymore. Is there any option te bring back my old phone. I dont even live on America.
What have I tired so far:
Factory Reset the phone
Master Factory Reset
Flash With ODIN and Samsung Tool Pro tool
When I flash it finishes sucssesfully but when turning on Installing System Update Fails. And takes me to recover mode when I reboot it shows AT&T logo during boot and its the same.
Can you help me?
Thank You in advance

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Are you sure it's not a sim card issue? Use your simcard in another device and see if it works.. Also, use any other simcard on your device and see if you get a signal..
If you're out of luck, then perform a factory reset from the stock recovery and see whether it helps?

Samsung Galaxy S6 G920F No SIM but it shows signal and sometimes reboot by itself.

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A person i know have Samsung Galaxy S6 G920F and just in a sudden his phone got turn off and when he try to open it it freeze for a second and restart.
He gave it to a friend and that friend install Android 7 ROM on it but it still freeze and restart.
Then, i download the ROM and flashed it. It is on for 2 or 3 days and no issue happened. But i tried to check for updates and it froze and restarted and when it reopened it continued to check for update and tells me that all updates are installed.
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why it do these things? are these errors known or rare problems?
Stock Samsung Rom? If not make sure you try that.
And that sounds like either bad battery or liquid damage inside phone.
Have you tried factory reset in recovery mode?
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I need help with my S10

Hello everyone!
Today I did a very stupid thing on my S10.
I found an AT&T sim card on my house because my parent bought an iPhone 12 pro max on a trip to the USA and the phone had this AT&T sim card. I inserted it asked me to restart my phone and now I have every app of AT&T and my mobile data button is not located on the notification panel anymore. Is there any option to bring back my old phone? I don't even live in America.
What have I tried so far:
Factory Reset the phone
Master Factory Reset
Flash With ODIN and Samsung Tool Pro tool
When I flash it finishes successfully but when turning on Installing System Update Fails. And takes me to recover mode when I reboot it shows the AT&T logo during boot and it's the same.
Can you help me?
Thank You in advance
NotSoWise said:
Hello everyone!
Today I did a very stupid thing on my S10.
I found an AT&T sim card on my house because my parent bought an iPhone 12 pro max on a trip to the USA and the phone had this AT&T sim card. I inserted it asked me to restart my phone and now I have every app of AT&T and my mobile data button is not located on the notification panel anymore. Is there any option to bring back my old phone? I don't even live in America.
What have I tried so far:
Factory Reset the phone
Master Factory Reset
Flash With ODIN and Samsung Tool Pro tool
When I flash it finishes successfully but when turning on Installing System Update Fails. And takes me to recover mode when I reboot it shows the AT&T logo during boot and it's the same.
Can you help me?
Thank You in advance
Click to expand...
Click to collapse
Have you inserted another SIM card now?
I would try to flash a complete stock firmware for your region, which is unbranded. Use Odin on PC and a USB cable.
Should work as long as your bootloader is unlocked and you can not into download mode.
If you flash a new CSC, your data will be wiped. Don't use Home_CSC, as you want to get rid of the AT&T bloatware.

Question Unable to unlock the phone, data recovery options?

Hello, my wifes stock S21+ crashed and rebooted. It now boots up, accepts SIM card pin code but UI crashes to black screen and reloads when you enter the pattern to unlock the phone. Phone is still locked and it asks for the pattern again. I can't activate developer mode/USB debugging because of this. I can call the phone and answer the call so the phone works, it just doesn't want to unlock.
Is there any way to get the data out? We do have backups but unfortunately yesterdays sons christmas event didn't get yet uploaded to the cloud. The phone has warranty but support said they will wipe the phone. I don't care about keeping phone under warranty, all I want is yesterdays data.
Safe mode has the same problem. I already tried flashing current and older stock firmware with Odin but same problem persists. Is there any other thing I could try?

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