credits: Mark Webber.
It would appear that older 256meg nand Ps3's need to goto 2.30.
Newer 16meg nand Ps3's should be fine from 3.15
1. Copy contents of the devusb folder to the root of a blank usb stick
2. Copy the PS3UPDAT.PUP from 2.30 to the root of the USB stick
3. Put the Service Mode Dongle into furthest left usb port
4. Press power then eject within .2 seconds
5. Wait until the PS3 turns off
6. Remove the Dongle and put the USB stick into the right side USB port on the PS3
7. Then press the power button on the front again.
8. The USB will now start to flash and do a "Drive Init" then install the PUP file.
9. The system will turn itself off again.
10. Power on and play a BluRay movie until the movie starts.
11. Shutdown PS3.
12. Remove the files from your usb stick.
12. Now exit servicemode; copy Lv2diag file 2, to your usb stick.
13. Put the usb stick with the Lv2diag file 2 into the furthest right usb port.
14. Press power on to exit "Factory Service Mode". The system will turn itself off again.
Update #3: If you have a 256meg Fat PS3 - Read On.
As we are all aware by now, downgrading kills BD playback on 256meg fats.
Made even worse now by the fact we may be using a drive we dont even know the history of, right?
Wrong, history is just that now if you have access to another 16meg PS3.
1. Insert the NEWEST BD movie into the 16meg PS3.
1a.This will update that system & drive with the latest HRL
2. Marry the drive you want to use on the 256meg fat.
3. Remove both the drives (mark them if you have to).
4. Place the drive from the 256meg onto the 16meg system and marry them up.
5. Update the firmware on your 16meg Ps3 to whatever you normally use.
6. Insert the NEWEST BD movie again into the drive now on the 16meg.
6a. This wil update the drive with the latest version of HRL
8. Swap the drives back over
9. Get the DRL files from the BD disc you used
10. Transfer the DRL files to the 256meg fat PS3 in the dev_flash3 folder overwriting the ones already there.