The USB-C port on the side of the radio is designed purely for charging the 18650 battery and powering the radio. It is not connected to the data lines of the microcontroller to allow for flashing firmware, as indicated by the user manual and hardware tear-downs.
Some extreme DXers desolder the factory microcontroller completely. They replace it with an external micro-controller like an Arduino or Teensy. By doing this, they can load custom open-source sketches (such as the famous PU2CLR Si4735 library) to unlock features like: Expanded frequency ranges Customized bandwidth filtering Alternative RSSI (Signal Strength) display formats
The internal firmware controls the gain, but it can only process what the antenna captures. Plugging a long-wire antenna or a magnetic loop antenna into the 3.5mm external antenna jack completely transforms the shortwave and SSB performance of this radio, bypassing the limitations of the built-in whip. Deploy a Ferrite Core on the Charging Cable
If you are experiencing issues (such as audio distortion or low sensitivity), a "firmware update" is not the solution. Instead, you can optimize its performance through hardware adjustments or factory resets. A. The "Reset" Method (The "Firmware Patch")
With the radio , long-press the 9 key or the AM BW button depending on your batch to view internal signal-to-noise ratio (SNR) limits. 2. Changing Temperature Display (°C to °F) Turn the radio OFF .
The most important fact about the XHDATA D-808 is simple:
Remember: The D-808 is a $60–$90 radio. If you brick it, the cost of repair exceeds replacement. But if you succeed, you will own one of the best-performing ultralight portables ever made.
| Feature / Generation | Original Version (2018) | 2021/2022 Revision | 2023 Revision (Current) | | :--- | :--- | :--- | :--- | | | Micro-USB port | Micro-USB port | USB-C port | | Display Backlight | White backlight | Yellow/Orange backlight | Yellow/Orange backlight | | PCB Version | MV02 (2017-08-29) | MV04 (2018-12-24) | Unknown (PCB and circuits changed) | | Audio & Tuning | Original performance | Audio improvements, same PCB | Tuning and filtering refinements |
Never try to listen to weak Shortwave or Airband signals while the radio is plugged into a cheap wall charger. Cheap switch-mode power supplies emit massive amounts of Radio Frequency Interference (RFI).
Don't blame the firmware if your shortwave reception is noisy. The D-808 includes a 3.5mm external antenna jack. Stringing a simple random wire antenna outside will drastically improve your SNR (Signal-to-Noise Ratio) far better than any software tweak ever could.
Since you cannot change the internal software, the best way to upgrade your XHDATA D-808 experience is through external hardware optimization.
Many users power the radio via batteries and only connect GND, TXD, and RXD.
Updating the firmware on your XhData D-808 can bring several benefits, including:
There is no way for an end user to update the firmware of a standard D-808.
Before updating the firmware on your XhData D-808, make sure to: