At the moment, the only option is to stay on sysnand 9.x if you want to continue playing the games. We need a fix from gateway. There is currently no way to use <512kb or >6.x encrypted dumped saves.
Dumping the game will get you your save, but it won't work because >6.x encrypted saves won't decrypt properly in Gateway mode.
You won't lose anything. The issues arise when you:
The error is normal behavior because it's a card 2 game. You get the corrupted save because dumped saves using >6.x encryption don't work in gateway mode, which is what this thread is about. The solution is to play the retail cart on sysnand or classic mode, until GW fixes Gateway mode.
- Downgrade from 9.x to 4.x or vice-versa (retail saves using >6.x encrpytion show as corrupt)
- Try to load a dumped save in Gateway mode
I read that if you have Powersaves, it can decrypt the >6.x encrypted save. I don't have a Powersave and will never buy one, so I can't really try it out. But this post confirms that it'll work:
https://gbatemp.net/threads/problem-with-pokemon-alpha-sapphire.378362/#post-5274406
I'm not a big pokemon fan, so i'll probably just move my pokemon to Pokebank and start a new game (or just use the community save lol)