If you go to the fixpak download webpage, you can see that U484610 is Fixpak 8.
There is a special note for people using fixpak 8:
Attention FixPak 8 customers: If you are using DB2 V7 FixPak 8, IBM recommends that you either apply a special FixPak 8 eFix or install a more recent FixPak. If you choose to stay at the FixPak 8 level, you can download the FixPak 8 eFix from the same FTP directories as the FixPak 8 packages (see below). The eFix packages are named like "special_PTFnumber.tar / .zip", depending on your platform. Please note that the FixPak 8 eFix will update your DB2 product signature:
7.1.0.75 for all 32-bit DB2 installations
7.1.1.75 for Sun, HP-UX, or AIX 4.3.3 64-bit DB2 installations
7.1.2.75 for AIX 5 64-bit DB2 installations