Yes, use the correct unlock process to fix it - this thread is for the 2nd gen FireTV box, not the 4k FireTV Stick.Hi there,
I have a FireStick 4k, one of those that serial # starts with G070VM1190xxxx.
It is stuck on Amazon white logo screen.
I tried adb but I get unauthorized. Tried OTG cable with keyboard and no luck.
Device is not rooted.
Follow the process laid out here: https://forum.xda-developers.com/t/unlock-root-twrp-unbrick-fire-tv-stick-4k-mantis.3978459