Xhdata D-808 Firmware Update 'link' Access

The Evolution of the XHDATA D-808 : Hardware Revisions Over Firmware Updates XHDATA D-808

To check if your radio requires an update: xhdata d-808 firmware update

Since you cannot flash new firmware, most issues are handled through "hidden" button combinations or factory resets: The Evolution of the XHDATA D-808 : Hardware