Hello today i write a full tutorial for go back on CEX From DEX without your original FlashCEX, So , in this tutorial i teach you for create a valid flashCEX...
Let's Go:

1) If you are on 4.XX CFW and you cant install 3.55 DEX install this CFW DEX [You must be registered and logged in to see this link.] with this you can downgrade on 3.55DEX

2)Donwload This CFW DEX and install it from XMB [You must be registered and logged in to see this link.]

3)Now When you have put 3.55DEX download this pkg [You must be registered and logged in to see this link.] and run it, If you see blackscreen but don't worry just turn it off from the ps3 power button

4)Now Open Multiman, FTP server enable, dev_hdd000 ->tmp-> Eid_root_key drag it to your desktop

5) Now we need to dump a flashconsole its easy, run multiman again and go on mmOS file manager, dev_hd00 , Position yourself above any file and open it with a double click, press SELECT+START, You will now receive three questions, answer no to the first two and the third answer yes, Now you have your flash into your USB stick

6) Now download this file for PC [You must be registered and logged in to see this link.] ,now install win32OpenSSL -> Go to your C: and check the name of the folder called "OpenSSL" you can rename the folder

7)Rename your flash to "in_flash.bin" and your eid to "eid_root_key_.bin" <- (Just add .bin exstension) now pick up this two file and drag to C: -> OpenSSL -> Bin

Now open command windows and type the following codes:

c2d.exe eid_root_key_.bin in_flash.bin out_flash.bin (target id)

press Enter and wait a few seconds, DONE! now you have in folder Bin another file called out_flash.bin

9)Rename out_flash.bin to 3.55DEX.EID0.NORBIN or NANBIND depending of your console and go to your ps3, run multiman, dev_usb000 double click on your modified flash, and you are done CEX/RETAIL.

10)Quit Multiman and turn it off ps3 via power button.

11)Now start your ps3 again, donwload CEX/KMEAW CFW and install it from XMB or Recovery (I have installed it from recovery) wait the finish Update and now you are again on CEX/RETAIL

NOTE: To Go on DEX again you can use your flash STEP 5, You only need to go on Rebug CFW's and rewrite target id, and now you have your flashCEX again and you can go on CEX whenever you want

Nice tut i know a few people this would have helped glad we have it *)

Nice! Thankfully I kept both of my original flashes