Vcarve does a great job of exporting gcode files with post processors just for tinyg. They work great.
The problem I had in dropping a crv file was user error, i.e. accidently grabbing the wrong file and dropping it on there.
I’ve managed to do that same mistake a couple of times, lol. It doesn’t always bork the bootloader, but sometimes it does.
Just glad I’ve got an Atmel programmer. It really is an easy fix if you have that.