I know, never update firmware, but....

Sorry for my english...
Before the upgrade, I root the tv with samygo, downgraded firmware from 2022 to 1012, I played with ssh and some xml config through ftp, but I needed to use plex client, and without firmware update, not work. For this reason, I downloaded the version 2003 (I'm not sure), put the pendrive, start upgrade... and now... tv start, but after 10 sec, I can't do nothing... remote not work, manual controller on backside not work, no shutdown possible. If I start in Service Menu, I arrive at "reset" button, but I can't do nothing... tv stop working.
Th tv is briked? Reset eeprom will help?
Wht I can do?
Thanks