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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
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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

nice one thanks alot

Thanks 2pac, since i lost both flashes, for both of my CFWS lol :p

Nice thread really helpfull

This is my third tutorial I've tried and my stupid ass console won't dump the root key it just hard freezes so I have to unplug it. Any idea why?

nice work

my ps3 3.56 and im on dex i lost my flash any help?

There is easier if you're on Rebug !

i cant run EID Root Key Dumper Successfully. i clicked on it and it gave me a black screen but it wont do anything. i cant even turn off my ps3 from the fron. i have to unplug it

Same here dude