macOS Big Sur: Your MacBook and iMac are about to get one of their biggest updates EVER | Express.co.uk
Got this 12” PowerBook, that only boots to this screen and not into open firmware. Is it firmware locked, and if so how can I wipe it and reinstall OS X? :
macOS Sierra - macOS X 10.12 announced at WWDC
macOS vs. Windows: Which OS Really Is the Best?
macOS 12 Monterey – 512 Pixels
Apple Mac OS X Yosemite: Sign Up For Beta Now | Time