I tried downgrading from 6.61 to 1.5 and accidentally Hardbricked my PSP. When moving from 6.20 to 5.50 I accidentally installed GEN CFW and now when I turned It back on it only shows the green light and nothing else turns on. I want to try and buy an Official/Genuine Sony battery and Memory...
It is better to use the separate emulators because the person developing the separate emulators has had the chance to get that system running on the PSP. With multi emulators that team/person has to worry about multiple systems and esp. with Retroarch you only get a limited number of systems...
Unbrick with magic ms and pandora battery by installing OFW, then udate to 6.61 and install permanent cfw; look at the video by MrMario2011 on Youtube. That should fix your psp!
Cruisn on the Wii is one of my personal examples of that, it's considered one of the worst games of all time, I loved it and completed it several times.