If you fail at any step, search XDA Forums for "Mi TV 4A T962 Unbrick Guide" – there is a short-pin method to force USB burning mode.
Rooting your XIAOMI Mi TV 4A 40 (L40M5-5AIN) involves unlocking its bootloader, installing a custom recovery, and then flashing a rooting tool like Magisk. Please note that rooting is an advanced procedure that voids your warranty and may affect system stability. Phase 1: Preparation & Unlocking Bootloader How to root XIAOMI Mi TV 4A 40 L40M5-5AIN
Bootloader is locked on Mi TVs, but if somehow unlocked (not officially possible), you could patch boot with Magisk and flash via fastboot . If you fail at any step, search XDA
Do not unplug the TV.
Since you cannot physically access the battery or download mode buttons easily, you must do this via the software. Phase 1: Preparation & Unlocking Bootloader Bootloader is