Hacking PSP go downgrading problem..help please

[SuperMoLOL]

hi evryone , i have a psp go, 05 g ,OFW 6.60.. so i wanted to down grade to 6.20 so i could use the permanent hack, but whenever i tried to do that it shows an error saying : "A later version of the system software is already installed. There is no need to update. (CAAFFFFFCF7)" im using chronoswitch to downgrade btw. and the weird thing is. i tried to downgrade from 6.60 to 6.39 and it worked!!!. wth? does anybody know a workout for that? thanx in advance

 

[xist]

If you're on 6.39 then try this to get to 6.20

I still maintain this is not worth the effort...

 

[SuperMoLOL]

If you're on 6.39 then try this to get to 6.20

I still maintain this is not worth the effort...

THANX ALOT! it worked, cheers!