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I hope you enjoy the benefits of extending the value of your iMac4,1, or being able to change your system back and forth for development purposes. There have also been requests for a MacMini1,1 and MacMini2,1 firmware tool, and although there doesn't appear to be a MacMini2,1 firmware image in any of the Apple provided downloads, I'm looking into the feasibility of extracting an image using a tool in the rEFIt package, so stay tuned. Everything is left on the RAM disk for you to look at and study, if needed. The program creates a small RAM disk, downloads the needed files, copies all of the scripts to the RAM disk, and then runs the scripts.
![download kext utility download kext utility](https://1.bp.blogspot.com/-iVNUH83WNYY/UG18zkffzdI/AAAAAAAAETc/IvF1R8uJPg4/s1600/kexts-wizard.png)
The download does not contain any firmware updater files or image files. If you have an iMac5,1 the program will warn you about downgrading, but will still allow the firmware update.
Download kext utility install#
The program checks the iMac model and will only install the iMac5,1 firmware on an iMac4,1, or the iMac4,1 firmware on an iMac5,1, whichever is appropriate. If you have a CPU in an iMac5,1 that isn't supported in the iMac4,1, the system will not boot after the update until a compatible CPU is installed. As usual, you can upgrade or downgrade at will. The core file set has been tested by a forum member (Thanks Martin), and while I don't have an actual iMac to test on, the files created for the firmware upgrade perfectly match the core file set that has already been tested. This firmware upgrade removes the 2GB RAM limit, properly identifies the Core 2 Duo CPUs, and Lion will install and run just fine.
![download kext utility download kext utility](https://i.ytimg.com/vi/4Q_bLKSCFDU/maxresdefault.jpg)
A lot of people have upgraded their CPUs, but are still stuck with the 2GB RAM limit and have to hack Lion to get it to run.
Download kext utility 64 Bit#
The iMac5,1 came with a Core 2 Duo CPU, and can take 4GB of RAM, and is a 64 bit platform, even though the kernel can only boot in 32 bit due to 32 bit EFI. The iMac4,1 came with the Core Duo processor, which was limited to 2GB of RAM, and was only a 32 bit CPU. This model was the first iMac introduced with an Intel processor in 2006, and they later updated the platform with Core 2 Duo CPUs. I was asked by a couple of fellow forum members to write a firmware tool for the iMac4,1 and iMac5,1.