The following is confirmed working with REX 4.21 CFW in full DEX mode.
I managed to get Final Fantasy XIII-2 to work 100% from mmDM, "NO FREEZING!!! @ Slot Machines or Chocobo Racing in Serendipity." It's somewhat a simple process but explaining it can be a tad difficult.
First, I had to resign the "Original/Untouched" EBOOT.BIN and .sprx files located in, "BlUS30776\PS3_GAME\USRDIR\", with keys 3.74+ so that mmDM would not produce decryption errors upon mounting the game for DEX mode. I was only able to resign the EBOOT.BIN and .sprx files correctly after adding the new keys from "TrueAncestor EBOOT Resigner 4.1" into Aldostools "ps3tools". After the new keys are added to Aldostools "ps3tools", simply right-click on the "Original/Untouched" EBOOT.BIN and .sprx files and choose "Resign EBOOT/SELF (3.56+)". After resigning the files with proper keys, mmDM is able to mount the game flawlessly.
Next is the 1.06 UPDATE, I FTP'd into the already installed update located @ "dev_hdd0\game\BLUS30766\USRDIR\" and deleted the "N0DRM" EBOOT.BIN and .sprx files so that I can add the "Original/Untouched" files from the OFFICIAL 1.06 update. With Aldostools "ps3tools" I downloaded the OFFICIAL 1.06 update and extracted only the EBOOT.BIN and .sprx files from within the "USRDIR" folder. After extracting the files I FTP'd the .sprx files back to the "dev_hdd0\game\BLUS30766\USRDIR\" folder, untouched, no need to resign. As for the EBOOT.BIN, before FTPing it back to the PS3 I needed make it DEX compatible. With Aldostools "ps3tools" you can do this by pressing, "Ctrl+Shift+Enter" while the EBOOT.BIN is highlighted. Once the EBOOT.BIN is fixed simply FTP the EBOOT.BIN back to the PS3 located @ "dev_hdd0\game\BLUS30766\USRDIR\".
Now that all the fixes are done you can mount the game with "mmDM/ProDG TM" and run the game with no freezes! ^^
PROTIP: The EBOOT.BIN and .sprx files need to be signed with 3.74+ keys and the only way to do this with Aldostools "ps3tools" was to add the updated keys (4.30) from TrueAncestor EBOOT Resigner 4.1 into "ps3tools". That is how I managed to get this working anyway.
I understand this tut may be somewhat difficult to understand for some, so if omnomnom can simplify this tut, that'd be great. If not feel free to PM me if anyone needs help understanding the process. Hopefully Omnomnom gets what I'm saying so that he can add it to 1st page lol.
USERS on 3.55:
I have not tested this with 3.55 DEX CFW so I'm unsure if this method will work. I understand the files would have to be resigned with 3.55 keys but we already had that with the N0DRM files and that's where the freezing came from to begin with. Maybe I'll give it a shot since with REX CFW I can swap from 4.21 to 3.55 and back to 4.21 pretty fucking easy. ^^
ALDOSTOOLS has just updated his "ps3tools" so there is no need to add keys from TrueAncestor EBOOT Resigner. And we have a new version of mmDM, Thank you Aldos!
Last edited by NeilJames; 11-06-2012 at 01:18 PM.
Reason: simplified a few steps and added some clarification