14款MacBookpro系统更新macos bug sur后无法启动
我的MacBook pro是2014年中期的，在安装Macos Big Sur 后一直在启动界面卡着进度条走了一半，重启也会继续在启动界面卡着，可以通过安全模式进入电脑（进去后显示的是Macos Big Sur 系统），但是会非常卡顿。这个问题怎么解决
MacBook Pro 15″, macOS 11.0
问题被标记为
我的13款最近也是遇到这个问题（wifi自动升级最新OS big sur后）开机卡界面无法启动，进入安全模式无法识别SSD。。。已送修
翻论坛欧美最近也有很多案例（https://support.apple.com/en-us/HT211242）造成极大不便，希望中国区能有个统一说法，谢谢！
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.
Published Date: December 09, 2020
