I've searched and found loads of threads on how to downgrade/go to CFW, but how do you go back the other way?
I've pre-ordered GT PSP which is the whole reason i bought the thing 4 years ago and truth be told I only use my PSP once a month or so. Basically, losing the ability to play homebrew/ISOs isn't an issue, i'll happily get around to finishing the likes of GT:VCS instead.
Is there a simple way to upgrade to official firmware from 5.00 M6 or do I have to make a Pandora Battery and go through some other means? Should I just look for an eboot, or will that create problems/stub files like on the Wii? Would just like to go to a completely 100% clean official one with no remnants that might cause problems.