Ok. I´m on rebug 4.21.2 and I succeed to make a pkg cheat for Dead Space 3 BLUS31053 Its full heath and stasis and infinite ammo, for version 1.0 if you have 1.01 installed delete it and then install this pkg:
Code:
http://www.mediafire.com/?t5d53a50m444lje
If you get a black screen, just take out your BD from drive, restart console go to MM and start the game (no BD mirror or what so ever), just start the game and then start it from APP/HOME when prompt to update to 1.01 just skip it and enjoy...

All greats to "medo" that released the codes.