If the TV turns black and does nothing for 15 minutes, you have used the wrong firmware. You may need a technician with a UART serial cable to revive it.
Reducing UI lag and improving app loading speeds. Firmware Update on XIAOMI Mi TV 4A Pro 43
have been praised for introducing long-awaited features, users have shared mixed experiences ranging from "game-changing" upgrades to frustrating performance dips. Key Update Experiences Android Version Jumps If the TV turns black and does nothing