I have samsung s10 plus g975u us variant. I believe it is unlocked since there is an app installed with name network unlock and I'm able to use it indian carrier currently using the device in india. Since a year I'm not getting any software update and i would like to flash it for updating. Can anyone tell me with firmware should i select. My buils number is G975USQS3CTB6 currently running android 10 one ui 2.0