How to update external iSight firmware?
Apple released an iSight Updater software package, which is still available online:
iSight Updater 1.0.3
https://support.apple.com/kb/DL502
The problem is that the software download requires Mac OS X v10.3
Panther to run.
iSight can also be updated on OS X 10.4
Tiger and 10.5
Leopard. The updater on those systems is located at:
\System\Library\CoreServices\iSight Updaters\iSight Updater
So, find an OS X 10.3
, 10.4
, or 10.5
machine (or VM?) to run the iSight Updater software.