Apple has these instructions for users of old MacBooks updating to macOS Big Sur – Times of India

Several users of older MacBooks, particularly 2013 and 2014 models, have complained of their machines getting bricked after updating to macOS Big Sur. These users have claimed that their Macs show a black screen after they tried to install the new software. The affected Macbooks are said to be MacBook Pro (Retina, 13-inch, late 2013) and MacBook Pro (Retina, 13-inch, mid-2014).
Apple has released a support document where it gives steps to install macOS Big Sur on these MacBook Pro models. As per the docuement, “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.” In such cases, Apple has listed the steps below to 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 the issue persists, reset NVRAM or PRAM.
Apple further says that if none of these solutions work, these users should contact Apple Support for further assistance. Apple has also released a new version of macOS Big Sur 11.0.1. However, it’s not clear if it resolves this issue with older MacBook Pro models.

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