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Im Bringing A Tut Today How To Convert From CEX2DEX otherwise
So Lets Get Started

CAUTION. KEEP IN A SAFE PLACE TO COPY OF YOUR CEX DUMP.
WITHOUT THIS YOU CAN NOT RETURN AGAIN TO CEX or UNBRICK YOUR CONSOLE IF NECESSARY.

The console must be on 3.55 CFW and have enabled the emergence of system files and hidden files on your PC.

1) Install and run FactoryServiceMode.pkg
2) Once the console launched in Factory Service Mode u need to close your ps3.
3) Copy the contents of the step 1 to a memory stick and fasten the right port of the PS3.
4) Open the console. The power led will start flashing green and then red. Not slamming the console will close itself once the process is finished.
5) Once you close the console remove the memory stick and connect it to your pc. Media should have created a file "Backuprflash.bin". This is the CEX DUMP us. To keep in a safe place.
6) Inside the memory stick copy the contents of the folder in step 2 and fasten the right port of PS3. Open the console and expect to close itself. On again and open the console coming out of the Factory Mode.
7) Install and run eEID_RKDumper.pkg. The console is closed and opened again. With FTP or file manager go to the path "dev_hdd0/tmp /" and get the file "eid_root_key" which rename it to "dump".
Run the CEX2DEX in your pc In "NOR / NAND flash dump" put the "Backuprflash.bin" and "METLDR dump" file "dump" and press "CEX -> DEX". When asked the name of the modified storage dump us, we put "rflash.bin"
9) Copy the "rflash.bin" and the contents of the file in step 3 memory stick.
10) Put the console again in Factory Mode and shut it down again.
11) Connect the memory stick to the PS3 right port and open it. The power led will start flashing and the registration process of the dump starts. DO NOT CLOSE THE CONSOLE WILL OTHERWISE BRICKS. The process can take some time (20'-40 '.
12) Once you close the console itself, copy the contents of the folder in step 4 memory stick and fasten the right door. Opening and waiting to go off alone.

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From here on the console is ready to accept DEX CFW. The pass through the normal XMB.
I install 4.50ita DEX CFW and its very good and i recommend u to install 4.50ita otherwise u need to install a d-rex rebug cfw

I Hope that helps

BTW Sorry for bad English

Enjoy