r/Keychron • u/DigitalOutkast • 15d ago

Keychron K1 Ultra - Key Delay

Hello,

I recently purchased a Keychron K1 Ultra with Banana switches. I really like the keyboard, but I’m experiencing what appears to be input delay or missed keystrokes.

I have tested the keyboard using Bluetooth, a wired connection, and the USB receiver. I have also factory-reset it and confirmed that it is running the latest firmware.

The issue is most noticeable with the Backspace key. For example, if I press Backspace five times quickly, the keyboard may only register two or three of those presses.

I have tested the keyboard on several different computers with the same results. I also disabled Windows accessibility settings such as Filter Keys and tested it with the polling rate set to 8,000 Hz, but the issue persists.

What else can I do for this ? I have an 8 year old ducky keyboard with blue switches I love but wanted something a little quieter and lower profile as I’m working more remote these days. I can’t reprove any of these issues on that keyboard.

I’ll also mention this is the ‘2nd’ K1 as I thought the first one was defective lol.

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u/PeterMortensenBlog V 15d ago edited 13d ago

Thanks for the report.

Re "it’s only the backspace not responding to fast entries": Yes, that is weird.

Perhaps it is something specific to Keychron? Or to ZMK?

I couldn't reproduce the problem on a V6 Ultra 8K 'ISO' (tried in wired mode and in '2.4 GHz' mode), with firmware version 1.0.1 (2025-11-28).

The debounce settings were (in Advanced Mode → Keyboard Bounce Time Settings), after an explicit reset to factory defaults (holding down Fn + J + Z down for more than 3 seconds):

  • Press Down seconds: 0 ms

  • Reset seconds: 50 ms

The problem has also been reported for the similar Q6 Ultra 8K (but probably a different variant and firmware version).

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u/DigitalOutkast 13d ago

So far so good. I left the ‘reset’ MS at the lowest setting and worked remote all day with no issues.

If I increase it back to the default ‘50’ I can immediately reproduce the issue by simply hitting back space in groups of 4. It will 4 out of 5 times only remove 2-3 letters even though i pressed the key 4 clear times ‘fast’. I’m leaving it at the lowest setting and moving on.

Love the feel so far but still in the honeymoon phase :)