Try a different USB port (preferably USB 2.0) or a different cable.
Launch the Rockchip Batch Tool (or Factory Tool). r329q v31 firmware upd download
Never turn off the PC or unplug the box during the flash process. Try a different USB port (preferably USB 2
Open the device to confirm the PCB says "R329Q." r329q v31 firmware upd download
Hold the "Reset" button (usually hidden inside the AV port with a toothpick).
R329Q V31 Firmware: Official Download and Installation Guide