Joined Dec 2005
L8: Grand Teacher
Forum Thread
Android 15 update says two SIM on S21 FE - can not turn off!
July 17, 2025 at
05:27 PM
Android automatically updated one of the two S21FE to Android 15.
{SM-G990U3/DS (when it was new, I did flash it with the default to get rid of bloatware - this created the DS on the model name.
The box it came with has SM-G990U2
SM-G990UCACXAU}
Prior to this, S21 FE had just one SIM (physical) and one IMEI.
Now it has IMEI 2 as "unknown" - besides can not turn off SIM2 on the SIM manager.
So the result is it shows the carrier name (SIM 1) and displays "invalid card" presumably for SIM2 on the front when u swipe it down.
Tips or tricks to fix this issue - turn off sim2?
{SM-G990U3/DS (when it was new, I did flash it with the default to get rid of bloatware - this created the DS on the model name.
The box it came with has SM-G990U2
SM-G990UCACXAU}
Prior to this, S21 FE had just one SIM (physical) and one IMEI.
Now it has IMEI 2 as "unknown" - besides can not turn off SIM2 on the SIM manager.
So the result is it shows the carrier name (SIM 1) and displays "invalid card" presumably for SIM2 on the front when u swipe it down.
Tips or tricks to fix this issue - turn off sim2?
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Samsung says all phones have issues after the update - they are releasing an update soon
Factory reset will revert back?
I meant hard reset not just deleting data
Samsung says all phones have issues after the update - they are releasing an update soon
Factory reset will revert back?
I meant hard reset not just deleting data
So you will have to look up your serial number and find the correct firmware for your phone then flash that over your current firmware, I believe that might be your issue. Please do more research as doing this incorrectly might brick your phone.