Hi, I was upgrading my hdd from 80gb 3.41 hdd too 320gb when i put in the 320 hdd plugged in my usb with folders PS3\UPDATE\PS3UPDAT.PUP which was 3.41 but when it was installing it gave me 3.50.. Downloaded three 3.41 .PUPS all with the same result i gave in and just installed 3.50 said i'll downgrade later which im now regretting big time.
Did a bit of reading and watched a vid on youtube put lv2diag.self (FILE 1) and the .PUP on usb not in a folder which is probably the problem. Plugged it in the right hand side port and started console. Thinking it would be about 5mins to complete went got something to eat cameback at least 15mins later nothing on the screen. Powered down the console went to start it starts for like 10-15secs then powers itself off even with the 80gb hdd it wont start. Any help for this would be great..