i have 2 same macbook air. about first one if hold option key when poweron selection usb drive or internal drive is active. about second one any of key comb. not work when poweron. recovery startup disk sel. internet recovery etc.
About Startup Security Utility - Apple Support
And if either computer has the T2 Touch ID
If you're using a Mac with the Apple T2 Security Chip, Startup Security Utility offers three features to help secure your Mac against unauthorized access
The Below will Wipe ALL DATA from the Drive and there is no getting the Data Back
1 - Shutdown computer and disconnect all external drive Except the newly created Bootable Installer.
2- Restart and immediately hold the OPTION key until the Startup Manager appears and choose the USB Drive.
3 - It will present options >> Disk Utilities >> View >> View ALL attached Drives.
4 - Choose the Upper Most Drive ( not the volumes indented and list below ).
5 - The drive normally is called Apple Media or Apple SSD - that is the drive to Erase and format as APFS with the GUID Partition Map.
6 - Once that is done >> backup out of Disk Utilities and choose install macOS.
7 - Follow the prompts and it may automatically reboot several time.
8 - Upon a final reboot - Setup Assist will present with the newer version of macOS.
Are they M1’s? If so, you may have to make the bootable drive on the Mac you want to use it on.
Please disregard what was on YouTube and use Only This method in the link https://support.apple.com/en-ca/HT201372 have personally use this method since Sierra, High Sierra, Mojave, Catalina and Big Sur and has worked every time.
mmbayramgil wrote:
i have 2 same macbook air. about first one if hold option key when poweron selection usb drive or internal drive is active. about second one any of key comb. not work when poweron. recovery startup disk sel. internet recovery etc.
What is on the USB Drive ??
Does the USB Drive have a Full Operating System of macOS Installed??
i have created macos big sur as a youtube videos. first macbook when hold option key on booting display selection of internal disk and usb drive. second macbook when hold option key on booting boot direct internal drive. these macbook are same.
comman-r not worked so i can not use start up sec. uti. and mac book air is about 2014-2015 not have t2 chip.
mmb
mac book air early 2015 a1465. i try make the bootable drive on the Mac i want to use it on.
option key and other recovery keys not worked.
i do it. but option key not worked. so i think something wrong about keyboard. thanks for all. i use external keyboard. try to install big sur.
usb boot
