sounds blunt. but did you change the global settings in the loader to use ios223?
you just need to change it on special games like metroid other M to that.
so if using cfg loader press two times 1 to enter global settings, revert it to ios250. save with 2.
go to metroid, press only one time 1. set to 223. press 2 to save.
play all games like normal
hope that helps