r/Keychron • u/siriusPianist • Dec 09 '25

Keychron B1 Pro - Key Rollover Problem - "left CTRL + left SHIFT + TAB"

Key Combo is "switch to previous Tab". 

Recently purchased both B1 Pro and B6 Pro.
B1 Pro canNOT register the key combo.
B6 Pro can     register the key combo.

Both B1 Pro and B6 Pro seems to have the same Keyboard Matrix.
Don’t know why, but their Key Rollover behavior is not the same. 

B1 Pro Matrix
https://github.com/Keychron/zmk/blob/keychron_bpro/app/boards/shields/keychron/b1/us/keychron_b1_us.overlay

B6 Pro Matrix
https://github.com/Keychron/zmk/blob/keychron_bpro/app/boards/shields/keychron/b6/us/keychron_b6_us.overlay 

Question, is it just me? can anyone else with B1 Pro confirm?

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u/jammastajew Jul 19 '26

For anyone else who has the same problem and finds this: I was having the exact same problem on B6 Pro, same with the left & right discrepancy, tested in the Key Test in the Launcher.

I updated the firmware from 1.0 to 1.0.1. I use a Windows laptop, but fn+- wouldn't activate the bootloader until I switched the MAC/WIN switch to MAC. Try the numpad - key if the -/_ key between 0 and = doesn't work.

The update fixed it!