Apologies if this is in the wrong section (there are so many!) and I did try to search before posting.

As the title says, Im on 3.80 M33 (Ancient huh?) My psp is the origional one (psp-1003 i think).

I want to get it back to the origional firmware which would have been the factory firmware (1.50)

Im sure its fairly easy to do but Ive not touched my psp in years and have forgotten all about using custom firmware and such.

Please lead me in the right direction

Thanks!