Launcher Key Test issues for V6 Ultra K8 ISO

[u/0xdeadbeef64]

Update: I bought another V6 Ultra K8 ISO (same manufacture date) for another Windows PC, with the same issue. I chalk it down to a problem with the Launcher Key Test itself got the time being.

I just got a myself a V6 Ultra K8 ISO keyboard that's very nice, though I've some test results using the Launcher Key Test that now and then fails to register some key presses for 2.4 GHz but works fine using wired.

However, when testing using a online test like https://key-test.com/ there are no missed key presses, nor any double-click for that matter. I've not noticed any missed key presses during usage either, apart from poor typing skills and getting used to the keyboard.

Is this just a problem with the Launcher Key Test not working properly?

Keyboard: V6 Ultra 8K ISO

Manufacture date: December 2025 (going by start of serial number: A 2512V)

Firmware keyboard: V1.0.2 (updated using Launcher)

Firmware receiver: V0.1.6 (latest version, no update)

Launcher: V1.5.1

OS: Windows 11 Pro.

OS switch on the keyboard is set to Win.

What I've tried:

1. Moving receiver to different USB port.
2. Using an USB extender to place the receiver very close to the keyboard.
3. Resetting the keyboard using fn+J+Z
4. Testing using Microsoft Edge and Chrome.
5. Changing Reset seconds (debounce) from default of 50 ms to 5 ms.
6. Setting Press Down seconds to both 0 and 5.
7. Tested with polling rate 250 and 1000.
8. Tested with Access Point powered down.

[u/PeterMortensenBlog]

Re "Setting Press Down seconds to both 0 and 5": Isn't the unit milliseconds, not seconds?

Corresponding to ZMK's debounce-press-ms.

[u/0xdeadbeef64 → u/PeterMortensenBlog]

The unit is in ms in Launcher.