升级了 10.12.1 键盘“a”键不工作的小伙伴看过来

https://forums.developer.apple.com/thread/64304 这个问答里的解决方案可行

Following polyzargone's post, I was also able to get the keyboard working again. Here what I did:

1. Disable SIP (System Integrity Protection). I searched on Google and followed a step-by-step tutorial.

2. Make sure you backup /System/Library/HIDPlugins/IOHIDKeyboardFilter.plugin

3. Make sure you have a earlier version of the same file. In my case I asked a friend to send to me (from the final non-beta Sierra 10.12.0)

4. Delete /System/Library/HIDPlugins/IOHIDKeyboardFilter.plugin by doing sudo rm -fr /System/Library/HIDPlugins/IOHIDKeyboardFilter.plugin (you will need to type a admin password (and I hope there is no "a" in yours...))

5. Move the earler version to the System's folder. Mine was in Desktop, so I did: sudo mv Desktop/IOHIDKeyboardFilter.plugin /System/Library/HIDPlugins

6. Restart.

7. Enabled SIP again.

需要的文件下载地址

https://doc-0o-7k-docs.googleusercontent.com/docs/securesc/ha0ro937gcuc7l7deffksulhg5h7mbp1/665hc9pkdkq7mqs3thgskq4kcbbqkeg9/1477375200000/05969126302347136768/*/0B7vNqB86p67FbHVPRTRlcjlaVHc?e=download