im on 3.90 m33-3 and i had some themes i installed under the theme folder on the psp and legit and working. then suddenly today i switched to a different theme that had previously worked and now my psp just lags like crazy doing anything. it isnt bricked i can access everything but it just lags like crazy and the screen seems to flicker.. is there anyway to change it back to 1.50 without using pandoras battery?

thanks

You can downgrade to 1.50 via Recovery Mode.

how would i go about doing that?

To get into Recovery Mode, turn off your PSP completely. Then hold down the R button as you turn it on and as it loads the Recovery Menu should pop up.

There's a guide in the FAQ section: http://www.psp-spot.com/forums/index.php?showtopic=41834

i fixed the problem, i went to recovery then went to format flash 1 or something and turned my psp back on and it it works fine now without the need to downgrade!

And in the end, we are all satisfied.

If i do this ill get back to 1.50 official fw right.

and after this will i be able to upgrade to custom firmware again ?
like if i downgrade to 1.50 will be able to get back to say 3.90 or other future fw's ?
thanks

lol There's only an official 1.50 FW and yes you will be able to upgrade to future official and custom firmwares alike.

naah i was asking because i saw a 1.50 Custom Firmware....proof of concept something on dark alex's site

Also, 2 more questions:

1.)The id storage things (no idea wht they are but i think they're pretty important ?) don't get corrupted during downgrading via recovery ?

2.)If i put say 2.80 official fw(or anyother lower fw) in there will the recovery downgrade to that instead ? or does it only work for 1.50fw

thanks

You are right; there is a 1.50 PoC CFW, but it will not downgrade to that.


It shouldn't get corrupted, no.
On another note, don't try to downgrade to 1.50 if you have a Slim PSP, as it will probably brick it.


It might work, but it would be safer to downgrade to 1.50 then update to 2.80 official firmware.

thanks