Downgrading from 2.0 to 1.5

[HanTzu]

I have a question. Will downgrading from 2.0 to 1.5 potentially damage my psp? thank you

[Video_freak]

No. There is a REALLY small chance for that...

[HanTzu]

what if it was never 1.5 to begin with? i think i read somewhere it has to be originally 1.5

[blackrave]

That's not true. You can downgrade completely safe as long as you follow the instructions correctly. And it's very easy, so you won't do it wrong.

[HanTzu]

ty also do u know how to put mp4 files on it? (music) it seems to only like my mp3 files

[SSaxdude]

I've downgraded a friend's PSP that was factory 1.52, so it doesn't need to be originally 1.5.

[dejkirkby]

Mp4 files go in the MP_ROOT>100MNV01 file or they will not work. The also have to be named M4Vxxxxx.mp4 (replace the x's with numbers)