Originally posted by Bleak
Tbh, I posted that method in other thread for a reason without giving too much away,
1.) Dump HDD on 3.15 inline edit the modded .ff into the .bin and repack
2.) Backup 3.15 onto an external
3.) Restore onto 3.30 (Im not so sure on 3.40 as the checksums here could prevent you from restoring from an older FW) but 3.30 works, and 3.30 can go live currently..
Hit me up on msn if you want to know anything more, I'm not going to spoonfeed the community however.
If it restores to the 3.30 ok it will be fine on 3.40
I updated my ps3 to 3.40 and then formatted and put 3.30 image on the hdd and there wasn't a problem. I think errors arise if the data on the image is messed with. But a full restore should be fine as the 3.40 will asign a checksum to the already modded data