3.90 to 3.90 m33-3?
I have a problem!! i would like to play ISO games but you can only play them with a cf!! ( well i think so) my psp has official firmware 3.90, but i want to have the 3.90 m33-3! how should i do that? some websites tell me i need to have the 3.52 m33-3 first!! or some even tell me i should downgade my psp to 1.50 first!!! could someone help me plaese, i really wanna play these games!!!! :( :( :( :(

U have to downgrade to 1.50 Use that tutorial

Yeah you need to downgrade to OF (Official Firmware) 1.50 first. This can be done in a number of ways that I am too lazy to say right now (:googlenoob:). After that you can upgrade to any CF (Custom Firmware) that you'd like, which is done very easily in many ways available on this site. Personally I recommend you upgrade to the la-*test*-('") version of M33 (3.81 I believe). Good luck and thanks for contributing to the site!

thanks alot i found it with google!!! yeah of course, you need to downgrade to 1.50 first, thanks for the hint!!!

you can also use pandora's battery if you like. It takes you directly to custom firmware 3.71 m33-2. all you need is a memory card a extra battery and a friend with CF (custom ) if you want the tutorial i could post it in the help section. PM me