wife accidentally updated a game now my switch is on a black screen

bought a modded switch about a week ago i figured out how to update the firmware to 18.0 right after it downloaded and installed my wife wanted to play Mario and i forgot to tell her not too update the game and well she ended up selecting to update and it gave an error. i don't remember what it said other that to press power to reboot so i pressed power and it kept looping to the same error message to press power to reboot and like a dumb ass i kept pressing and holding the power eventually the switch went black. no buttons work but it is recognized by tegrarcm. how do i fix it?