Hacked my Wii back when I was 8 to play CTGP cause I was absolutely fascinated by MKWii Custom Tracks. I remember running into problems with the old Letterbomb exploit but eventually getting it working after moving files around on the SD Card, this was pre CTGP launcher from what I remember so to actually play the tracks you had to use Riivolution which takes me back lol.

Didn't hack any other consoles for years till I decided to fiddle around with 3DS modding, which was a nightmare in itself as I didn't have an SD card reader so I had to opt with doing it over the network via some fiddly method which probably extended the method by about 3-4 hours, I started at like 1am and ended up being finished by 6am lol (on a school night too, which was a bad mistake)

Last console I modded was my old Switch, it was very fiddly but honestly the end result is so great, been playing Pokémon SoulSilver on it lol

EDIT: actually forgot, in 2021 I got my hand on two Megadrives and did a simple region mod to switch them over from PAL 50hz to NTSC 60hz, which is surprisingly easy since it only involves cutting traces on the board at some jumpers that decided region and language, only requires that you buy an RGB Scart cable to use for output afterwards since the colors get messed up if you don't.