How to unbrick from a DEX to CEX conversion

When it happens? When doing a DEX to CEX conversion, when you're in 3.55 DEX firmware after flashing the CEX EID0.NORBIN in Multiman CEX, you shutdown the ps3 and the PS3 won't boot anymore. EDIT: according to sandungas this problem has something to do with syscon hashes when you go to DEX higher firmwares, so be careful when you go to higher firmwares

Brick sign On boot, the ps3 console, after 5 "double beeps" very fast and turn off after 3 seconds - no video output See an example: P1000663 - YouTube

Preparation - USB Dongle to go to factory mode (ex: E3 Card Reader) - USB Pen formated as FAT32 (help if it have led status to check if its working and ps3 is doing his stuff) - 3.55 CEX Firmware PUP with prepatched lv1 (no syscon hash checks)

Notes: - Use always the right USB port (next to BD/power button/eject button) for the USB Dongle and the USB PEN - You will not have video output until step 8

On the computer 1. Format USB PEN and put lv2diag.self [http://www.ps3devwiki.com/files/lv2diag/3.55%20down...E1/Lv2diag.self] file 1 [http://www.ps3devwiki.com/wiki/Downgrading_with_Har...sher#PUP_to_use], the one that is green, also put PS3UPDAT.PUP in the root of the PEN (the 2 files must be in the root of the USB PEN)

On the PS3 2. Switch off ps3 from power cord 3. Put the USB Dongle with service mode payload in the right usb port 4. Put power cord in the console 5. Press power button followed quickly with eject button, the console should boot, and then reboot without any beeps 6. Remove service dongle 7. Put the USB Pen with the 2 files inside in the right usb port If all went well you shall see the ps3 reading stuff in the usb pen, and the hard drive of ps3 working, wait for the console to power off. 8. At this point you can power again and check if the console boot up and its inside factory mode (red square box in the bottom left of the screen) 9. Power off the PS3

On the computer 10. All you need now is to get out of Factory Mode, so put lv2diag.self [http://www.ps3devwiki.com/files/lv2diag/3.55%20down...E2/Lv2diag.self] file 2 in a FAT32 blank USB Pen

On the PS3 11. Put the USB Pen in the right port with the file already on it 12. Power on (the console will power off automatically) 13. Power again and should be ok