When Apple releases a firmware update, the updater will download to the Utilities folder and run from that location. It will then automatically launch, apply the update, and restart your system. After the update is complete, the system will give you a notification that the update has been successfully installed and that should be the end of it. However, while this is what is the normal behavior, some people have mentioned this final notification keeps popping up at every system reboot.
Apple discussion member "davynm" writes:
"I updated my Mac mini to Snow leopard a couple weeks ago and I updated all the software after. I went through all the firmware updates and now, when I start up no matter what, I get the nag notifications saying that my firmware and bluetooth firmware are up to date every single time OSX starts."
As in davynm's case, this may happen if you have upgraded your firmware after upgrading to 10.6 Snow Leopard since the updaters were built under 10.5 Leopard and there may be some small incompatibility with them under Snow Leopard. If this happens, first check the system profiler to ensure the firmware actually has been updated, and if so then you can remove the firmware update installer program from the Utilities folder. For some reason Apple does not automatically remove the updaters, and since they are responsible for these messages a quick solution is to remove the updater application from the Utilities folder. You do not need to keep the updaters once they have been applied; this goes for any, including those for iPods and other peripheral devices (keyboards, mice, displays, etc).