If you can’t install macOS Big Sur on certain 13-inch MacBook Pro computers from 2013 and 2014
Follow these steps if you can't install macOS Big Sur on a MacBook Pro (Retina, 13-inch, Late 2013) or MacBook Pro (Retina, 13-inch, Mid 2014).
When you install macOS Big Sur on these Mac models, the installer might say that the update cannot be installed on this computer, or your Mac might start up to a blank screen or circle with a line through it .
If your Mac no longer starts up successfully, these steps might help resolve the issue:
Press and hold the power button on your Mac for at least 10 seconds, then release. If your Mac is on, it turns off.
Unplug all external devices from your Mac, including any displays and USB accessories, and remove any card inserted in the SDXC card slot. Then turn your Mac on.
If the issue persists, reset the SMC as described for notebook computers with a nonremovable battery.
If none of these solutions work, please contact Apple Support for further assistance.
This article will be updated as more information becomes available.