Hello!
First, THANK YOU!!!!
My (day one) Smash Bros cartridge didn't boot, after several years staying unused.
Stuck on a black screen on my modded o3DS, stuck on the 3ds splashcreen on my not-modded n3DS.
Sometimes it even showed a message on my o3DS, that i can translate like "this cartridge can't be read" when I pressed A to launch it.
I ran your cartridge fixer (on my o3DS), and after ~2H, no bloc skip just letting it run, the "verify" was still "fail".
But the game is now playable again! Without any loss (data...) or side effect.
Note: 1st successfull launch, I was able to play Adventure Smash, Streetpass mini game, buy trophies in the shop... Then I tried to launch a Smash game 1V1 vs AI, I was stuck with a black screen after character select, when I was supposed to chose the map. I pressed Home, tried to exit the game, the message saying the game is quitting took forever so I decided to shutdown my o3DS by pressing the power button for 10sec.
Restarted the o3DS, re-launched the game, then was able to play a Smash game 1V1 vs AI with no problem. Then I was able to exit the game as normal, with that soft reboot of the console (old model...)
So, even if the 1st launch wasn't flawless, in the end everything looks good
Again, thank you!
Now I start to think about going full eShop for Switch 2 lol, cartridges are not 100% reliable i guess