I converted from DEX to CEX tonight, went from DEX to OFW 3.55 then to rebug 3.55.3. When I got to rebug nothing would load anymore. When I start multiman, rebug toolbox, or anything else the screen goes black but nothing ever loads then I have to hold the power button to shut off. I am able to install pkg's and followed this tut to convert from dex to cex if it matters. I really need some help and have no idea what to do next to get multiman loading.

If you lost your original CEX dump you can create a new one:
1) Install the "CFW 3.55 DEX With Retail Patched CoreOS" inside the archive
2) Install and run the homebrew eEID Root Key Dumper.pkg
3) Copy your key from /dev_hdd0/tmp/eid_root_key to c2d_WithNandSupport folder in the archive
4) Create a dump of your DEX flash (use MultiMAN, memdump, preloader.. etc)
5) Copy the dump to c2d_WithNandSupport folder in the archive
6) Use c2d to create your CEX dump (see c2d readme for help)

How to Convert from DEX to CEX
1) Install the "CFW 3.55 DEX With Retail Patched CoreOS" inside the archive
2) Install the last version of Deank's MultiMAN for CEX (min ver 4.10.00) <--- DEX version won't work
3) Install also rebook.pkg and qa_flag_extra.pkg
4) Run MultiMAN and open the filemanager (SELECT+START)
5) Rename your FLASH-CEX dump properly (if you don't have one read below how to create one)
If 16 MB dumo rename it in FLASH-CEX.EID0.NORBIN
If 239/256 MB dump rename it in FLASH-CEX.EID0.NANDBIN
6) "Open" the dump pressing "X" twice and say "yes" to all questions
7) Close MultiMAN by pressing PS, do NOT power off the PS3 until i say it
8) Run the homebrew reboot.pkg
9) Run the homebrew qa_flag_extra.pkg <--- If you don't hear 3 beeps try again or you'll brick
10) Power off the PS3
11) Enter in the Recovery Menu and install the original 3.55 CEX <--- Don't install it from XBM or you'll brick!
Successfully tested on my Slim without qa-flag but it should works on NAND too :rock: