Install this seems easy. Gonna wait a few days maybe week. Need to know what the heck is happening with the 4.25CFW downgrader so we can go back to good old 3.55Kmeaw. Need the stupid proof answer for this before I try anything.
Also Johnny at ps3repack has had it for 2 days and he says: (You need to get upgrade version if you want downgrade option.
OTHERWISE, YOU CANT GO ANYWHERE AFTER UPDATING THIS.) So am gonna wait to see what the fallout is. Only got one PS3 on Cex 3.55kmeaw.