I too am still on Rebug 4.21 - but, thats how the console came to me when I ordered it. I would love to upgrade, but every time I try to upgrade, I get told that there was "No applicable Update" was found. I put a folder named "PS3" (IN ALL CAPS) in the root of the usb (before this, i formatted the USB to FAT32) then I put a subfolder in the folder named "PS3" - named that one "UPDATE" (in all caps) and then renamed the .pup file to PS3UPDATE.PUP (in all caps).. and I get told that "no applicable update was found."

Any help in updating this old thing would be great. Had it for a week now and still have not been able to create a psn account because the icon is red and every time I try it tells me that a system update is required - go to system update > update from server or whatver. Driving me mad man!

You should open a new thread explaining your full problem instead of bumping old threads.