How to Upgrade PowerBook Firmware( All Hardwares )

How to Upgrade PowerBook Firmware( All Hardwares )?
Thank U in advance

If there is a firmware upgrade available for your model of PowerBook, it will appear when your run Software Update and also be listed at http://www.apple.com/support/downloads/
Then you download the installer and run it. Usually you have to do something like hold down the Command key and Power button while you're restarting.
Firmware updates don't come along very often. The last one I can remember installing was for my B&W G3. The last firmware upgrades I can see listed for a PowerBook were for the 550MHz or 667MHz G4s back in 2002.
Is there a specific reason why you're asking about firmware upgrades?

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