![]() ![]() If that update does not complete properly, the Touch Bar firmware can be corrupted, which can leave your Mac cycling endlessly through crashing during startup, then restarting again – an infinite boot loop. This has been updated as part of macOS Sierra updates, including 10.12.4. The latest MacBook Pro 2016 models with a Touch Bar introduce additional firmware, which is used by the processor which drives the Touch Bar. If none of these help you start your Mac up successfully, you’ll need to get it to an Apple engineer, either through a Genius Bar or Apple support. Other models require different versions of the CD, and you can see the range of downloads offered here. This process is detailed here.įor an iMac 5,1 or 6,1 and some other older models you should use CD version 1.4 from here. Older models require you to create a Firmware Restoration CD, provided by Apple in the form of a downloadable disk image, which you can then burn to CD with Disk Utility on another Mac. A 2016 MacBook Pro should do the same, but in silence. ![]() If it does not, you can try resetting its SMC and NVRAM, as described here. Once complete, the Mac will restart normally and should function correctly again. ![]() Once a recent model has sounded the tones indicating it has entered EFI ROM recovery, a progress bar should be displayed, during which recovery will take place automatically. old models, prior to about 2008-10, may need to be started up from a Firmware Restoration CD to restore the EFI ROM.MacBook Pro 2016 models will not make any tones, but should also automatically recover the EFI ROM,.more recent models should automatically recover the EFI ROM after sounding the - … - tone,.If something goes wrong with an EFI ROM update, or the Mac loses power during the update, the Mac can be left with corrupt firmware, and may refuse to start up properly. These are usually listed in the Installations item in System Information, which will also give full details of the installed version. All models which are upgraded to run High Sierra receive a firmware update as part of that installation. Spontaneous corruption suggests that something even more serious is going on, and needs full hardware diagnostics.ĮFI ROM updates only occur now as part of a macOS update. The great majority of problems with EFI ROM corruption occur when an EFI update is interrupted. Much older PowerPC and Classic Macs are different again, and some flash the display rather than making error tones. one long tone when you hold the power button – EFI ROM update is in progress (Macs before 2012).three long, three short, and three long tones (the inverse of Morse SOS) – EFI ROM is corrupt and is being recovered.three tones followed by a 5 second pause, repeating – installed RAM has failed initial testing.a single tone repeated every 5 seconds – no RAM has been detected.normal startup chime – memory and ROM appear good, normal startup will continue.On Intel-based models prior to the MacBook Pro 2016, the following sounds are possible: Do not disturb or shut off the power on your MacBook Pro during this update.īoot ROM or SMC Version Information: After MacBook Pro update has successfully completed, your Boot ROM Version will be October 2016, Macs made sounds when starting up, to indicate their health or serious problems. It will take several minutes for the update to complete. When your MacBook Pro restarts, a gray screen will appear with a status bar to indicate the progress of the update. Your computer's power cord must be connected and plugged into a working power source. The MacBook Pro EFI Update will update the EFI firmware on your notebook computer. This update includes improvements delivered in MacBook Pro EFI Firmware Update 2.2 that enables Lion Internet Recovery from an Internet connection, resolves issues with Apple Thunderbolt Display compatibility and Thunderbolt Target Disk Mode performance on MacBook Pro (early 2011) models. This update fixes several issues to improve the stability of MacBook Pro (early 2011) and MacBook Pro (late 2011) computers and is recommended for all users. ![]()
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