First of all, make sure you've got the latest firmware from Radioddity/Xiegu. CLICK HERE to download it.

It is possible that the firmware needs to be reloaded. This is most often seen when the radio is connected to a computer and turned on. I am including the firmware file

Open the link below, download and install the Teraterm terminal program v4.96

https://osdn.net/projects/ttssh2/releases/
　

Plug the USB Cable into the computer and open Device Manager. Click on the Com port, observe port number and set Port speed to 19200 BPS

Leave radio turned off

Open TeraTerm

Choose Setup, then Serial port

Verify com port number and confirm port speed is 115200 BPS

Hold the Space Bar and turn the radio on

Choose 1 to Update FW

Old FW is erased

When the FW is erased, You will be prompted for the new FW file

Choose File, Transfer, Send

Highlight the FW file, and put a checkmark in the Option for 1K. It will not load properly if this is not checked

Firmware transfer is started

On completion, you will be prompted to reboot your rig

Turn Radio off
REMOVE POWER CORD FROM RADIO AND COUNT TO 10
PLUG POWER CORD BACK IN
Turn on the Radio and the operation should be restored.