Is it possible to downgrade firmware 4.00 on my psp?

Question

I upgraded my psp to the official firmware 4.00 but there is a chance that its not possible to be downgraded so im just wondering......

Answer 1

You need pandoras battery and magic memory stick.

Answer 2

1st you need to downgrade using a pandora. This involves making a pandora battery: http://www.dcemu.co.uk/vbulletin/showthr...

Then you need to make a magic memory stick.

http://www.pspmod.com/forums/firmware/26...

After is is downgraded to 3.71 M33 you can upgrade to 3.80 M33 and then to 4.01M33