Initial, highly acclaimed version.
. Unlike modern Software Defined Radios (SDRs), it is a traditional DSP-based receiver where the firmware is permanently flashed onto its internal hardware during manufacturing. xhdata d-808 firmware update
While you cannot update the firmware yourself, XHDATA has quietly rolled out hardware and factory firmware revisions over the years. Early production models handled charging and backlight behavior slightly differently than newer runs. Initial, highly acclaimed version
If you experience high noise floors, unplug the charging cable. The D-808 runs quietest on pure battery power, away from noisy switching AC adapters. but it is far less jarring.
Old firmware muted audio for 300ms between each 1 kHz step. New firmware reduces this to ~100ms. It is not seamless (like a DSP radio), but it is far less jarring.