How to install custom firmware on a psp with a psp with custom firmware

[V0RTEX]

Hi guys i can't seem to find out how to install custom firmware on a psp running 3.11 with a psp running already running custom firmware 3.90m33-2 i remember reading it somewhere a while back but can't find any information on it any help or links would be greatly appreciated.

[Draconis]

Not sure if you are saying its custom firmware 3.90m33 and you want to downgrade back to 3.11 or vice versa but provided you have a modded psp already.
[GUIDE] Make the Perfect Pandora's Battery - QJ.NET Forums
Will help you make a pandora battery that can unbrick and downgrade any psp.

If that doesn't help you might want to clarify what it is you are trying to do exactly.

[V0RTEX]

sorry i have a psp which already has custom firmware on it. But i friend asked me to put custom firmware on his and i remember reading somewhere that you can hack a psp with a psp that has custom firmware on it but im not sure how. My hacked psp has 3.90 m33-2 and the one i want to hack has 3.11.

[Draconis]

Then the above guide is what you need.
After follow all the steps you will have a magic memory stick and pandora battery. With those you can dowgrade and unbrick all psp's.

if confused about a certain section just ask

[lp4u]

since u already have a psp running cfw, just download PSP GRADER and make your MMS. then download hellcat pandora and copy it to your psp running CFW and use it to make the battery pandora. then put the MMS in your friend psp and insert the pandora battery wilst holding the L butto. then press X and wait

voila

[V0RTEX]

thanks guys got it done today cheers for the help

[aien]

thank gaiz! its good to read this stuff, but i could only undrstand da hole stuff. is it mandatory to make the pandora battery to play games???