Originally Posted by DEFAULTDNB
I heard it was more to do with the updater module in fw's 3.60-4.30 having extra checks added to prevent modded update pups being installed.
Modding and signing the 4.xx pup wouldn't pass this check, and so can't be installed even with correct keys.
I could be wrong here
I'm still on 3.56OFW, but I doubt many others are. If the modules were added in 3.60+ then maybe there's still hope. That said, it seems we'd need the keys, and I doubt any devs would be working on such an old firmware version.