[Nextis]

I think the update installs game files to the HDD $ checks the Game Eboot & when it see's the Eboot is unpacked it repack's it so then copying back the unpacked lets the game run I think the eboot installin the updated files to other game files. to find out for sure you need to check all the files size's before the update then check them when done file.
P.S. I heard when some eboot's are copy to the ps3 v usb the ps3 unpack's them. if its like this then we can try takein PSN domo's & send one to the ps3 v usb it unpack it then add a file in the game and repack it.heres how some game domo's got updates for them.