With help of members here, I was able to successfully root, install TWRP and flash Justin's ROM to use a domestic SIM card in LS980 and it seems working perfectly! However, I got a notification on my phone that update was downloaded and ready to be installed. I remember reading somewhere that installing this update will undo the root, flash, and etc.
Can someone explain how to disable T-Mobile OTA updates on LS980 flashed with Justin's ROM?
Can someone explain how to disable T-Mobile OTA updates on LS980 flashed with Justin's ROM?