Get yourself "demo installer". Put your dl PKG update into a folder named "00000002". ( Last number is up to you , do it in a chain for every update---2,3,4...)
Run Demo installer and under"task folder" choose the folder number you take before.
Under package name put in your update name.
Now "select PKG", choose your update.pkg you dl before. Select "Create pdb." ,choose the folder the update is in...i.e. "00000002".
Turn on your Ps3 in JB mode and run FTP server. Go to "game/vsh/task/" and transfer your "00000002" update folder into here.
Turn off your PS3 and back on WITHOUT JB! Under Games you`ll see your Update to install. Thats it.
If you want more updates to install just make more folders in chain ..."000xx1,2,3,4" and put them all into task folder on ps3 hdd.
Choose the Update proper to your game region, so BLES-Europe etc.
Not all Retail Updates will work, just a few so far.