Are you using the Burning tool windows application? I have tested it many times and it have always worked fine with or without anything on eMMC.
Please follow these steps:
- Power off the Device.
- Start burning tool in windows.
- Select the Image as per your device model/serial number.
- Press Start.
- Connect USB-A to USB-A in the computer and the OTG Labelled USB port.
- Insert the power pin in the device.
- It should detect the device.
These are the steps in Official Tutorial and have always works for me. If it doesn’t work for you then please check if the USB-A to USB-A cable is functional, the Windows pc have the right drivers needed.
Good Luck.