PSP Fat 3.52 M33-4 to 3.71: need help

[Ashwood]

Trying to upgrade my good old PSP Fat with the latest from M33 (currently attempting 3.71), but whenever I try to use the Updater program, the icon comes up "Corrupted data". Any ideas?

[djbrotherson]

Make sure you're not using a lexar memstick or some crap memstick

If you want to upgrade I strongly suggest to learn how to make a pandoras battery first cuz basically you can downgrade any psp and have the pandoras battery do all the work and upgrade you to the latest firmware.

If you do a google search you could most likely find a guide on upgrading

check this

http://forums.afterdawn.com/thread_view.cfm/616311