Anyone wanna participate? Tired of waiting for retina imac efi update. we can try to dump fw image off running mac. Need owners of retina imac (any model I think). First thing to run, in terminal: ioreg -l -w0 -p IODeviceTree > ~/Desktop/ioregdump.txt Then upload the file ioregdump.txt from your desktop somewhere. This will allow to find where firmware image is located in efi's memory.