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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

OG_LionModz, the reply mraztekhd posted should help bud!

Can u help me on skype m8

Ah it's alright man I found my old root key from the first time. Thanks though.

you could just install 4.65 rebug an that will dump your rootkey then you could you could also dump your dex flash with it both can be found in rebug toolbox..once you convert your flash to cex you can swap target type an install 4.65 rex then just intsall 4.66 habib

when dumping rootkey on 4.65 your rootkey will be dumped in dev/hdd0/game/rebug toolbox/usdir

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so we install rebug after this part then?

Install rebug when you are on 3.55 CEX

so this tutorial is kinda backwards?

I think its a bit rushed and/or outdated

do you have skype?