software update problem

[Monir0337]

Sir i useing samsung S21 ultra

I buying this phone for Revive

This phone can't have software update and security update there are not available in any software 

last software update in September 2023

I check all the way i know 

I search in Google and search YouTube video but not Working tips and trick 

please sir send me URL I can update m

y software I can update my phone 

[Monir0337]

Check screenshot

[أبوسرور١٢٢]

Because you device is locked on US carriers if you remove the US sim card, you won't be able to receive OTA update

You need to download the update from this trusted website and flash it via PC or laptop 

The tutorial & odin link in the page below 

warning: use CSC home instead of CSC in order to wipe your date up 

https://samfw.com/firmware/SM-G998U

https://samfw.com/firmware/SM-G998U/ATT/G998USQSBGXF1