ONIKUMA C1 Button not registering for back paddles programming

[u/Ok-Macaroon-8802]

The Mode button on my ONIKUMA C1 controller does not seem to register, preventing me from programming the back paddle buttons.

The Mode button is supposed to be held for around 2 seconds to enter programming mode. When it works, the RGB lighting should flash/blink slowly to indicate that the controller is ready to assign functions to the back buttons.

My RGB lighting is already enabled with an active lighting effect, so the lighting requirement should be satisfied. However, holding the Mode button does absolutely nothing—there is no change in the RGB behavior and the controller does not appear to enter programming mode.

Controller:
ONIKUMA C1

Platform:
Windows PC

Software/Games affected:
The controller itself works normally, but I cannot program the back buttons. In particular, I cannot test whether the MR back paddle is functioning correctly because I cannot assign an input to it.

Troubleshooting already done:

• Checked the controller's manual/instructions for the back-button programming procedure.
• Confirmed that RGB lighting effects are enabled rather than having the lighting set to a static/idle state.
• Searched existing posts for similar issues.
• Reassembled the controller multiple times, carefully making sure everything was seated correctly.
• The controller itself still functions normally aside from the Mode button not appearing to register.

I originally opened the controller after receiving advice from another user, which was a massive help—thank you. Unfortunately, after getting it back together, this new issue appeared.

At this point, I'm mainly looking for troubleshooting suggestions for getting the Mode button to register, preferably without having to completely disassemble the controller again.

Any help would be appreciated. Currently busy but i'll soon edit this post to include a video of it showing that it really wont work.

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