(make sure you backup all your files first in case you do something wrong)
Step 1: Download the files and go to where you put your game and edit your pram.sfo to say 3.40 with PS3SFOEdit.
EXAMPLE OF WHERE YOU MAY HAVE PUT YOUR GAME:
Step 2: Update the game to 1.02 using the retail update for your region.
Title ID - BLUS30591: http://b0.ww.np.dl.playstation.net/tppkg/np/BLUS30591/BLUS30591_T1/e3a3ed7da8ea52fb/UP0002-BLUS30591_00-CODBLOPSPATCH001-A0102-V0100-PE.pkg
Title ID - BLES01035: http://b0.ww.np.dl.playstation.net/tppkg/np/BLES01035/BLES01035_T1/f3208a72c5905392/EP0002-BLES01035_00-CODBLOPSPATCH001-A0102-V0100-PE.pkg
Title ID - BLES01032: http://b0.ww.np.dl.playstation.net/tppkg/np/BLES01032/BLES01032_T1/0036efc1b6e9aeaf/EP0002-BLES01032_00-CODBLOPSPATCH001-A0102-V0100-PE.pkg
Title ID - BLES01033: http://b0.ww.np.dl.playstation.net/tppkg/np/BLES01033/BLES01033_T1/58898b36ad3011c1/EP0002-BLES01033_00-CODBLOPSPATCH001-A0102-V0100-PE.pkg
Title ID - BLES01031: http://b0.ww.np.dl.playstation.net/tppkg/np/BLES01031/BLES01031_T1/6a49eecc0796b10e/EP0002-BLES01031_00-CODBLOPSPATCH001-A0102-V0100-PE.pkg
Title ID - BLES01034: http://b0.ww.np.dl.playstation.net/tppkg/np/BLES01034/BLES01034_T1/a4df11340e14a452/EP0002-BLES01034_00-CODBLOPSPATCH001-A0102-V0100-PE.pkg
Step 3: After your update has finished, open comgenie or ftp and go to:
dev_hdd0/GAME/"Blackops"/PS3_GAME and put the eboot in the pack here
To clarify, in other words: dev_hdd0/GAME/"Blackops"(BLxxxxx)/USRDIR and put the eboot in the pack here
Step 4: Go to dev_hdd0/GAME/"Blackops"/PS3_GAME/USRDIR
Now if you have the BLES01032 version just use the SFO.PRAM file inc in my pack and place it in that directory overwriting the old one.
If you have another version of the game use PS3SFOEdit to edit your sfo to say 3.40 in advanced edit. SAVE IT then replace it.
To clarify, in other words: go to dev_hdd0/GAME/"Blackops"(BLxxxxxx)/ and copy the sfo.pram file to your pc.
To edit the sfo file use the sfoeditor i've inc in my pack click load and choose your PRAM.SFO file.
Click Advanced Edit where it says 3.5000 change this to say 3.4000 and press ok. press save and save it to the desktop or somewhere you will be able to see it easy. now either put it on a usb drive and copy it back with comgenie or ftp it back to the folder it came from.
Step 5: Double check everything, Then play.
The next part comes from hunter128 from here and seems to only apply if you have run the game previously and been prompted to update.
After you install the pkg launch a FTP server and go to /dev_hdd0/mms/db/ and search a file called metadata_db_hdd open it in a hex editor and search 3.50, and change to 3.41
REBOOT OR YOU WILL GET EITHER A ERROR OR BLACK SCREEN.
Big thanks to teh reaper for testing this and confirming it working on external and internal HDD.
Also it seems that multiplayer freezes at the moment, but campaign and zombies works fine!
This is the way that works atm I'm sure there will probably be a simpler way soon.
Stay tuned for more PS3 Hacks and PS3 CFW news, follow us on Twitter and be sure to drop by the PS3 Hacks and PS3 Custom Firmware Forums for the latest PlayStation 3 scene updates and homebrew releases!
-change the param.sfo on my GAMEZ folder to 3.40.
-update the retail package.
-using filemanager I changed the param.sfo and eboot in internal hdd.
-copied the metadata file to my pc and searched for 3.50 but there was not any.
I ran the game black screen comes and after rebooting my update retail package is gone from game data utility and has been gone to game menu as Unsupported data. Any idea?
Do I have to change the param.sfo only with paramsfoedit program or I can do it manually by notepad? Do I have to change the eboot.bin in my GAMEZ folder as well?