If the "Connected Devices" square in the tool turns Green , you are in Loader Mode.
Necessary for your Windows PC to recognize the TV box in "Loader Mode." r29 mxq lp3 v23 firmware link
A massive archive of Rockchip firmware.
Your USB cable is likely faulty or you aren't using a USB 2.0 port. If the "Connected Devices" square in the tool
A USB Male-to-Male cable (required to connect the box to your PC). Step-by-Step Installation Guide r29 mxq lp3 v23 firmware link