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!