IF you deleted the default_mp.self file then you need to replace it, because this file contains the information of which server to connect to so if you delete it, it wont join anything,
IT shouldnt matter if you change the PARAM.SFO file because this only gives information to the ps3 for when you go into the "game data" section and click on information,
The eboot file just tells the ps3 what firmware you are on so if you get the eboot file from the 1.12 and put it in the 1.11 patch then it thinks its on 1.12 and not 1.11 lol,
The default_sp.self you dont need to worry about this its just a security file for single player to try and stop you from using cvars, hope i helped if you need the 1.11 files or the 1.12 files just message back and ill post them