Diagnostic, Recovery, Safe, Startup Manager, Verbose, reset SMC/NVRAM, firmware restore, Target Disk/Display, Single-User (SUM) in outline.
Firmware Restoration
After an interrupted firmware update, my iMac refuses to start up. What can I do?
Diagnostic, Recovery, Safe, Startup Manager, Verbose, reset SMC/NVRAM, firmware restore, Target Disk/Display, Single-User (SUM) in outline.
After an interrupted firmware update, my iMac refuses to start up. What can I do?
The Eclectic Light Company 