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Here is a tut to go back to cex if you have lost ur flashes
this is working as i have done it before

Step 1
download 3.55 DEX downgrader and install it from recovery menu

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Step 2
Install CFW 3.55 DEX With Retail Patched CoreOS after you have finished installing 3.55 downgrader
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Step 3
Now you have to install memdump via pkg file
once installed open it press X and it will dump the flash on your usb drive
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Step 4
Now you need to dump ur eid_root_key
Install eEID_RKDumper.pkg
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Once downloaded run it and it will then black screen (no GUI) and restart the console automatically
Copy and paste the eid_root_key to your USB it should be in one of these locations.

/dev_hdd0/tmp/eid_root_key or
/dev_hdd0/game/FLTZ00010/USRDIR


Step 5
Ok now you can update to any rebug cfw like 4.46 but it has to be D-REX or ITA once you have dumped your flash...
Dont update to the latest rebug cfw 4.65.2

Step 6
First download You must login or register to view this content.
Extract it to your C drive and install openSSL once installed rename the folder to "openssl".
Rename your DEX Flash(flash_store_3.500) to "flashDEX" and eid_root_key to eid0 and Then copy both the file in c2d Folder

Now your folder should look like this
You must login or register to view this content.IGNORE THE flashCEX it should be flashDEX.bin
Open a CMD window in the current directory (CTRL+SHIFT + right click > Open a command window here)
and paste this into it and press enter

    c2d.exe eid_root_key.bin flashDEX.bin flashCEX.bin 89

Your last number could be different here is a table showing you which one to put
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now your flashCEX should be in the folder

Step 7
Rename "flashCEX" to "my.CEX.EID0.NORBIN (nor Consoles)/myCEX.EID0.NANDBIN (Nand Consoles)"

Step 8
copy my.CEX.EID0.NORBIN (nor Consoles)/myCEX.EID0.NANDBIN (Nand Consoles) to USB Device and Connect it to your PS3
open multiman > mmOS then double click myCEX.EID0.NANDBIN /myCEX.EID0.NORBIN in USB Device and Choose yes>yes>yes
go to XMB and Turn off your Console with Controller
now Turn on your Console.

Step 9

Your are now finished install any CEX cfw that you want and make sure toggle QA is enabled

if you then want to go back to dex make sure to keep ur dex flash

Credits:
DEREKTROTTER for C2D TUT


IF anyone needs extra help pm me your skype and i will help you

I get up to the part with CMD but when I type

c2d.exe eid_root_key.bin flashDEX.bin flashCEX.bin 89

It just says this:

EID key : 48 bytes (eid_root_key.bin)
Wrong format of EID key file: 16777216 bytes (16MB) expected, but 251396096 foun
d!

i had same problem with eid root key so i used this tut and did the cmd and named my files different from dereck trotters tut and it worked

Hey think I might of gone wrong at part 4

Step 4
Ok now you can update to any rebug cfw like 4.46 but it has to be D-REX once you have dumped your flash...
Dont update to the latest rebug cfw 4.65.2

( I download and installed: REBUG 4.46.1 D-REX EDITION ) < ( could that be the problem? )

So when I do this: Now you need to dump ur eid_root_key
Install eEID_RKDumper.pkg pick the one for the cfw you are on Download:You must login or register to view this content.
once downloaded run it and it will then black screen (no GUI) and restart the console automatically
Copy and paste the eid_root_key to your USB it should be in one of these locations.


My PS3 FREEZES and will not let me restart to dumper any help thanks ?

do i install all the pkgs from the mem dump folder?

thanks so much for this tutorial bro! i lost my cex flash or whatever its called and without this tutorial i dont i wouldve ben able to go back to cex! thanks man i appreciate it !

it works fine for me... lol

The same thing is happening to me. Can you PM me your version of eid dumper?

I must be unlucky lol

i had the same problem when i first did it. il have to check what i did on my ps3 with im back