I'm aware, thank you, I've been away for years as well, so there's no time pressure, I'd still like to recover this hardware issue regardless.
In the meantime, I managed to do a System Transfer after four years because pressing hard on the left...
Can you provide specifics as to what tools you used? My n3DS KTR-001 is still in this state and there's not much to lose. All buttons seem to work in GM9 somewhat. Honestly I'd like to just do a system tranfer but I can't reach the settings :/