Frequent troubles with Mac becoming bricked during macOS Big Sur update
The entire OS at the timing at which the latest OS 'macOS Big Sur' was released for the Mac is that to slow
macOS Big Sur Update Bricking Some Older MacBook Pro Models --MacRumors
https://www.macrumors.com/2020/11/15/macos-big-sur-update-bricking-some-macbook-pros/?scrolla=5eb6d68b7fedc32c19ef33b4
Early macOS Big Sur adopters running into teething issues | AppleInsider
https://appleinsider.com/articles/20/11/16/early-macos-big-sur-adopters-running-into-teething-issues
During Install, stuck on Black Screen | MacRumors Forums
https://forums.macrumors.com/threads/during-install-stuck-on-black-screen.2267620/
For example, Mac user nuoptik wrote in Apple's support community that when nuoptik tried to update to macOS Big Sur, he could see that the Mac had no status bar and was barely backlit. It is said that it has become the state of. When nuoptik forcibly shuts down the Mac because there is no other way, after that, it seems that it can not be started because it does not say anything. It seems that recovery mode can be executed, but the load bar cannot be reached, or the chime does not sound when trying to reset PRAM. “The only thing you can see is that the backlight is on, which means you can see that there is a little light on the screen and the Apple logo on the outside is shining,” nuoptik wrote.
MacBook Pro bricked after failed Big Sur… --Apple Community
https://discussions.apple.com/thread/252034110
There are many other reports that the Mac got stuck on a black screen when I tried to update it, and it has been talked about in the forum of Apple information site MacRumors.
During Install, stuck on Black Screen | MacRumors Forums
https://forums.macrumors.com/threads/during-install-stuck-on-black-screen.2267620/
Similar reports can be seen on reddit on overseas bulletin boards.
MacBook Pro died after Big Sur update: mac
https://www.reddit.com/r/mac/comments/ju0miw/macbook_pro_died_after_big_sur_update/
There were also multiple reports that 'the boot logo has been frozen for 2 hours and there are no signs of booting.'
Symptoms like the one above are common on the 13-inch MacBook Pro released in late 2013 to mid-2014, 'these models are the oldest models supported by macOS Big Sur.' Mac Rumors points out. Some people who interacted with Apple's support claim that the problem was communicated to the engineering team, but Apple has yet to provide a clear cause or solution. The exact number of users of these models is unknown, but it is believed that those users should forgo updates to avoid issues.
In addition, many other problems have been reported in macOS Big Sur, and problems such as being unable to install updates or slowing down the OS have occurred due to server problems.
With the release of the latest OS 'macOS Big Sur' for Mac, the speed will be slowed down to OSs other than Big Sur --GIGAZINE
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in Software, Posted by darkhorse_log