Hi all, I live in Pakistan and recently bought Samsung A51 (6 GB Ram and 128 GB ROM variant). I noticed that the call recording feature is absent in the phone app. I did some research and found that if I flash a stock firmware for India i can get call recording feature. I need to know:

1 - If it is ok to flash the indian firmware on my A51 and still have it work on my country's mobile networks?
2 - Does flashing a firmware of different region change the IMEI numbers of the phone?
3. What would be the warranty status if I flash the said firmware?
4. What if something unexpected happens, would I still be able to flash the most recent stock firmware for Pakistan that is, A515FXXU3BTD4_A515FOJM3BTD4_PAK?

Yesterday I received the Samsung update and now I am at version: A515FXXU3BTD4/A515FOJM3BTD4/A515FXXU3BTD4
Security Patch level: April, 01, 2020

The firmware I intent to flash is : A515FXXU3BTD4_A515FODM3BTE9_INS

Waiting impatiently for someone to guide me in the right direction. Thanks in anticipation