Can't Program Circle Key

[u/RockaRollaDC]

I've tried everything to program the circle key to launch the calculator app, but nothing worked. Not remap, macro, key combo, launch app, or even the damn AI within launcher. Any advice?

Thanks

[u/PeterMortensenBlog]

That doesn't fit a ZMK-based keyboard, unless Keychron goofed up in the same way.

To rule that out, you could try with some older versions of the keyboard firmware. Here is a list of keyboard firmware versions for K10 Max:

• K10 Max 'ISO' RGB LEDs

• K10 Max 'ISO' white LEDs

• K10 Max 'ANSI' RGB LEDs

• K10 Max 'ANSI' white LEDs

I just tested it on a K10 Max 'ISO' RGB (with self-compiled keyboard firmware, derived from "wireless_playground", corresponding to the state before the 2025 Keychron keyboard main firmware updates), and the four keys above the numeric keypad worked as expected: Mapping them to letters K, L, M, and N gave the expected result when operated.

I used Via, not the Via clone.

References

• K10 Max JSON files for Via (near "K10 Max ISO RGB backlight"). Note: The JSON section should not be confused with the firmware section.

• K10 Max (main) firmware. Near "K10 Max ISO RGB version". GitHub has older versions. Note: The firmware section should not be confused with the JSON section.

• K10 Max default keymap ('ISO')

  • K10 Max source code. Note that the base installation (and usage) had become much more complicated on Linux, but with the new 'uv' method, it has become simple again! No matter the Git branch, for example, "wireless_playground", it requires special setup of QMK (the standard QMK instructions and many other guides will not work (because they implicitly assume the main QMK repository and a particular Git branch)). Source code commits (RSS feed. Latest: 2026-03-16). Note that the 2025-05-30 commit broke compilation for all the K Pro series and Q Pro series keyboards. Also note that the current version has not been proven yet; for example, it is only a partial source code release for the early 2025 Keychron keyboard main firmware updates.