![]() 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. 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. 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.
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