Used iMac Firmware Update for Mac?
Once the update is downloaded, read the ""About iMac Firmware Update"" file for important and necessary instructions on how to complete the update.
The iMac Firmware Update 4.1.9 will only run on iMac computers with slot-loading CD or DVD drives running Mac OS 9.1 or later from a local drive. If you are using Mac OS X you must boot from a local Mac OS 9.1 or later writeable partition (not a CD or network disk) prior to following the update instructions.
Developer’s Description
By Apple
Explore More

7thShare Mac Data Recovery
Trial versionCool Tools
FreeApple Aluminum Keyboard
FreeCocktail (Catalna Edition)
Trial version
uFlysoft Photo Recovery
Trial version
BlueStacks Air
FreeMacClean
Trial versionGarmin MapInstall and MapManager
FreeSmoothCursor
Trial version
Deliveries
PaidGarmin POI Loader
FreeGarmin WebUpdater
Free