ROG Phone 5 ROG Kunai 3 right controller not working when attached to bumper

[Andimoo]

Please tell us some basic information before asking for help:
Model Name: ROG PHONE 5 / ROG KUNAI 3
Firmware Version: I cannot even check the firmware version nor update it
Rooted or not:not
Frequency of Occurrence:Always
APP Name & APP Version (If your issue relates to the app):Home screen, Any games
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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The right controller does not work when attached to the bumper. The phone will display this message: "Analog audio accessory detected The attached device is not compatible. Please contact the accessory manufacturer for further support. It used to work for the first few months. It stopped working since around July.
However, the controller does work fine if I connect it to the phone using a USB C cable. Both sides of the controller will work.

How do I solve this issue? I cannot seem to trigger a firmware update as well.

[Andimoo]

Yes managed to trigger it again. It seems only work if you scroll the game toolbar using portrait mode.
Landscape mode does not work.
Update failed (5th try)

[Andimoo]

The controller seems to turn off on its own.
After I turn it back on it triggered an update after about 10 seconds.
Seems like you don't have to scroll the game toolbar. Just turn the controller back on to trigger the update.
Update failed (6th try)

[Andimoo]

You can speed up the process by manually turning the controller off and on it again.
Once the controller is turned on it will trigger an update in about 10 seconds.
Update failed (7th try)

[Andimoo]

Update failed (8th try)

[Andimoo]

Now trying the firmware update method but with the controller attached to the usb c instead.
It has been a minute and no firmware update is triggered.