Ensure you aren't using a "charge-only" cable.
The device must be in a specific mode to accept a flash. Merely plugging in a powered-on Android tablet via USB is often insufficient for flashing firmware. rkdevtool no devices found
It was 2:00 AM, and the only light in the room came from a flickering monitor and the stubborn, single red LED of a "bricked" development board. The screen mocked me: Ensure you aren't using a "charge-only" cable
After this, “No Devices Found” should disappear from RKDevTool. rkdevtool no devices found