Are there any “known bugs” with boot mode support? I build my firmware from “master” – Pulling the latest Model 01 then running make maintainer-update-submodules in the keyboardio repo. Since January when I attempt to login to my Macbooks with it the first key I press is repeated infinitely until I press “Delete”, then no further keystrokes are recognized from either the Model 01 or the internal keyboard until I unplug it and replug it in again and the process repeats. If I login from the internal keyboard then use the Model 01 it works perfectly.
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I’ve been having this problem too! I’ve seen it with windows as well when I reboot via boot camp. I’m forced to replug the keyboard.
Boot mode used to work in the past, a lot of time was spent making it work. We did a number of changes in Kaleidoscope that may have broken it. I’ll look into it as soon as possible. I think the keyboard reports its in boot mode, but still sends NKRO reports, at least what you describe sounds like that. I’ll check on my mac mini soon (hopefully).
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Not sure if it’s helpful, but… +1.
The keyboard definitely worked for me in the boot mode previously. Last couple of days I started tweaking my layout so I updated to the latest firmware and ran into this exact problem when I restarted my machine a couple of minutes ago.
Turns out the bug was… elsewhere than where I suspected. Jesse fixed it yesterday, Kaleidoscope master should now work properly on the macOS login screen again.
For the curious, the issue was introduced during a refactoring, and resulted in keys never being released when in boot mode. Sorry about that!
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Thanks for the update @algernon! I just reflashed one of my keyboards and it works on the Mac login screen. 
It also works on a Dell PC with BitLocker encryption that was exhibiting the same pre-login behavior.
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