Though it is an unusual occurrence, a Mac may encounter a broken or damaged EFI partition which typically prevents the Mac from booting and the Mac OS system software from loading.The server becomes unavailable when you use Server Diagnostics. You can press the Option key at startup to start up Server Diagnostics Mac OS X or Server Diagnostics EFI. The Startup Disk pane of System Preferences can start up Server Diagnostics Mac OS X, but not Server Diagnostics EFI.Any of the four updates can be downloaded from Apple’s Support Website or via. The EFI Firmware 2.0 updates require a MacBook or 13-inch MacBook Pro running OS X 10.6.5, and just 1.98MB of space.It also removes and unlocks the Mac (2010 – 2017) EFI BIOS passwords instantly. The EFI Card fixes EFI BIOS chip or firmware corruptions and boot loops that may have caused by Clover or similar EFI bootloaders. Our new solution, EFI Card Instant for MacBook, MacBook Pro and MacBook Air (Solderless EFI Chip).Following content was authored by To simplify the installation process, I wrote a little installer that can set up an external drive with automate-eGPU EFI.