I'm running High Sierra 10.13 on a Macbook Pro Touchbar 2017 with British keyboard.

When at the desk I use a Corsair K70 mechanical keyboard set as British Mac layout. I don't look at the keys to type and prefer mac layout so no problem.

Seemingly randomly though, my `/~ key which is usually left of z started producing §/±, which is usually left of 1, and vice versa. I've checked Keyboard preferences and its set as British Mac keyboard, but the layout image is wrong, this is what I get:

keyboard preferences

Whilst this is what my friend gets, and what I would expect (this one also matches a UK Mac keyboard layout whilst mine does not):

enter image description here

The keyboard on the Macbook itself works fine with the correct keys.

I think this may have gone wrong when I installed the latest macos update.

The options panel offers very little flexibility, I've tried swapping to a US keyboard and deleting the British layout then adding it again but no luck. Anyone know how to correct this?

1 Answer 1


Your machine thinks your keyboard is of the ANSI type when it is actually of the ISO type. See this note for some possible help.

  • 2
    Please: cite and quote this link only answer; anyway.+ Nov 6, 2017 at 23:34
  • Ah that makes sense, I didn't know the layout it was suggesting I had was ANSI. Followed the instructions on the link that you provided specifically deleting the keyboard plist and then rebooting, that brought up the keyboard setup assistant again which correctly identified my keyboard as ISO. Not sure why that happened in the first place, I believe it changed after the latest macOS update but all is well now, thanks!
    – matthewrk
    Nov 7, 2017 at 13:24
  • Thats helps, but layout is still reset after re-connecting keyboard, and you need to re-run assistant again
    – Xotabu4
    Sep 11, 2019 at 13:49

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