With the transition from Intel to Apple Silicon (M1, M2, M3, M4 chips), the architecture of the Mac fundamentally changed. Macs are now essentially massive iPads in a laptop chassis. This means they no longer use traditional BIOS or EFI firmware, and they no longer use standard macOS installer apps for deep system restores. They use Universal Mac IPSW files.
This pillar page connects all of our deep-dive guides into the macOS firmware ecosystem. If your Mac is stuck in a bootloop, showing a blinking question mark, or completely dead, you are in the right place. Apple Silicon Macs can almost always be saved using a secondary host Mac and the correct IPSW file.
Unlike iPhones which have unique IPSWs for every model, all Apple Silicon Macs share a single massive file called a Universal IPSW. But to use it, you must understand Device Firmware Update (DFU) mode.
If your Mac is unresponsive, you have two options to fix the firmware: a Revive or a Restore. Knowing the difference could save your personal data.
Sometimes a beta macOS update goes horribly wrong, or your SSD loses its partition map.
Bookmark this hub! We constantly update these links as Apple releases new M-series hardware and macOS versions.
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