You should try a downgrade to v9.2.8.5. If the error was really caused by the update, then the error should disappear with the older image.
I would suggest a different combination, and preferably use a WeTek image only for WeTek devices.
Recommended image: MXQ-4K-Pro_2G, dtb: gxbb_p200_2G_1Gbit.dtb.
I can't provide a remote control configuration until I see what kind of remote control it came with from the factory. Can you send a photo?
Edit:
Do you have this device? -> https://www.gearbest.com/tv-box-mini-pc/pp_555824.html