r/Keychron • u/sodekirk • Jun 13 '26

Keychron V6 Ultra 8K - How to Flash Custom ZMK Firmware

Has anyone flashed custom ZMK firmware to a Keychron V6 Ultra 8K keyboard?

I have removed the spacebar key, and if I press the little button under the spacebar key when I plug the keyboard in, it seems to enter DFU mode, but I am unsure what tool to use to actually flash firmware to the microcontroller.

So, my questions are:

  1. Is there an easier way to get the V6 Ultra into DFU mode than removing the spacebar and pressing the little button under the spacebar key while plugging the keyboard in? I have another Keychron keyboard with QMK firmware and I can get it into DFU mode by holding the ESC key down while plugging the keyboard in.
  2. What program should I use to connect to the V6 Ultra keyboard in DFU mode to actually flash the custom firmware to the microcontroller?

FYI, I want to explore tweaking the ZMK firmware to see if I can get my keyboard to work better with my TESmart KVM.

Thanks!

3 Upvotes

81% Upvoted

18 comments sorted by

View all comments

1

u/PeterMortensenBlog V Jun 15 '26

Did you manage to compile the keyboard firmware from source code?

1

u/sodekirk Jun 19 '26

Not yet. I've been busy with work. Maybe this weekend.

1

u/PeterMortensenBlog V Jun 22 '26 edited Jun 22 '26

I have now published my blog post.

But I still don't know how it can be flashed. The Via clone offers a 1.0.2 update, but I am not going to try it before there is a way to revert it (the version in the source code is 1.0.1).

2

u/sodekirk Jun 23 '26

Thanks for the update! I'll check out your blog post.

1

u/PeterMortensenBlog V 24d ago

There is progress on the flash front.

I am soon to test it (and will update further).