Hi. I have a TA-1004
i bought it used though in warranty etc.
Phone is on android 8.0.0 with 1 march 2018 security update.
Whenever i check for software update, it says your phone is upto date.
I downloaded the zip file and when i tried to upgrade it from stock recovery, it said you cant downgrade. As that 8.1 OTA zip had feb security patch.
I need help. How to update?