For guy having black screen with Mass Effect 3 DLC on dex. Mate, you cant play games or DLCs fixed for CFW on dex. only untouched original games with updates. Since these ME3 DLC PACK is with huge edats fixed Im not sure you can play this at all. Maybe if we make completely new repack with new conf info for dex convert but this is a huge drag for large repacks like this. Convert back to CFW.
Legend of Dragoon - virtual mem card black screen. Every ps1 game on ps3 requires a "virtual memory card". On ps1 consoles we had those mem cards to save progress, now ps3 makes a file like virtual mem card to save your ps1 games progress. Regardless whether you want to save your ps1 games or not, you have to create virtual memory card.
About MW3 proper fix - COD MW3 patch is fixed for both regions ages ago by me and also by EXEtrimALL. You can use either fixes from me or EXE, they both work. You must use BD-Mirror option in MM and then run the game. Make sure you get original game eboot and param in your game. Install patch and run MM, it will fix param for you.
Finally... Yes, FIFA 12 EURO DLC is fake. I know, since I fixed EURO DLC long time ago, but we cant use it because FIFA12 game requires update patch fixed so DLC can be visible in game. When game update patch is fixed, then I can release EURO DLC in 3 seconds.