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Updating firmware on an imac

Drives that you may want to replace "just because" even if they still work.Older G3 Macs can support drives as big as 128 GB with no trouble; there's no practical way to overcome this 128 GB limit (the Intech Speed Tools mentioned in our article on big hard drives in older Macs costs , more than these old i Macs are worth).Bill keeps a hard drive with Mac OS 8.6 handy for this.You can't do a firmware update from OS X, which is one more reason to install the Classic Mac OS even if you don't plan to use it for anything but firmware updates.Apple released firmware updates on Thursday for 2011 models of Mac Book Pro, Mac Book Air, i Mac, and Mac mini.All of the updates improve stability and fix unspecified issues. While that doesn’t affect many users, there is also a fix for other boot-related issues.You can determine what version of firmware is installed by choosing About This Mac under the Apple menu in OS X and then clicking the More Info button.

Mac OS X 10.4 "Tiger" usually ships on DVD, although it was possible to order it from Apple on CD.If you support a lot of Macs or do a lot of refurb work, as Bill does, it's worth setting up a "cloning mule" to facilitate the process.The most important step in upgrading tray-loading i Macs, Blue & White G3 Power Macs (especially the Blue & White G3), and a few other Macs of that period is making sure you update the firmware before you install any software updates or new versions of the Mac OS.One of Bill's tricks is to do the entire Mac OS installation in another computer, one that supports two internal hard drives.You can use a Blue & White Power Mac G3 or any Power Mac G4, as the drop down door makes access to drives fast and easy.That's where the CPU, memory, and that pesky firmware are stored.You'll still need to update the firmware on the module you just removed.... For instance, some tray-loading i Macs think they have 32 MB memory modules installed when running Mac OS 9, but when booted into any version of OS X, the recognize them for what they are: 64 MB modules. A-D i Mac reporting 32 MB modules, he boots into OS X to see if they're real 32 MB cards or misreported 64 MB ones.I've been carrying on an extended email conversation with Bill Brown for months.Bill is more-or-less the IT guy for an intense volunteer Mac program at a senior center.Slow, low-cost hard drives that may have 8-9 years on them by now.Hard drives that may not be big enough for Mac OS X 10.4 "Tiger".


  1. Thank you for posting this! A few more details for those who might need it----when you download the firmware from the 8bitdo website and are running the firmware update, if you are on a mac you may have to go into security settings to allow your laptop/computer to run software that is not on the App Store.

  2. Jan 29, 2012. Hello. Being the Software collector i am, I just bought a very good used copy of Mac OS X Jaguar. This is a major update to my mac because it is running OS X 10.1. I heard something about firmware on a mac, and I'm very confused. I looked on some youtube videos and saw how to boot into Open.

  3. Dec 7, 2007. Update the Firmware. The most important step in upgrading tray-loading iMacs, Blue & White G3 Power Macs especially the Blue & White G3, and a few other Macs of that period is making sure you update the firmware before you install any software updates or new versions of the Mac OS. You can.

  4. Sep 29, 2017. Without those updates, affected Macs could be "vulnerable to a variety of known public EFI security issues," they added. Apple Update to MacOS High Sierra. The researchers found that 16 Mac models have not received any EFI firmware updates the iMac 7.1, 8.1, 9.1, and 10.1; the MacBook 5.1 and 5.2;.

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