Pls enter the add device interface,, and click the bluetooth icon, select "others" to add, and select the device icon and press the continue option, you can see more detail about how to add device via the link: https://www.youtube.com/watch?v=oeRm-h2PfeQ

Pls try to search Brand Denon, Model: AVR-X4200W, any difference?

Have replied you via email, pls kindly check, tks

Operate Me--X1 settings--Firmware update for X1-Remote in the app, if there is no new firmware to update which means your X1 is the latest firmware version

Sorry for the all inconvenience, will pass your feedback to our enginnees team, tks for your support.

Suggest kindly try it at first.

Per the issue, pls use key assignment to change different inputs to the device I took a video for you, hope it can help you better know how to Reassign Function https://youtu.be/HTKHJ2psmJ0

Sorry for the inconvenience, will pass your feedback to our engineers team , tks for your support

Regarding the problem of abnormal control of individual infrared devices, it may be related to the length of the infrared signal emitted by the X1. We will allow custom adjustment of the signal in the subsequent upgrade to avoid some devices responding too fast, too slow, or not responding. pls kindly help us wait patiently for it, tks

Apology for the all inconvenience, will pass your feedback to our tech department, tks for your support.