Help Needed !

I had just downgraded to a 1.50 psp from my old 3.50. I then thought that to play PSX ISO's i had to upgrade again so i upgraded to 3.51 m-33. Now i cant play homebrew games anymore and im totally stuck. Can anyone help ?

when that happens its funny... turn off the psp, now turn it back on while holding the r trigger. a menu will appear open settings and change te game kernel to run on 1.50 that will fix your problem... or just rename the game folder on your memory stick to game150