Rkdevtool No Devices — Found

If you've done everything above and still see you have a hardware-level problem.

If you're encountering the issue "no devices found" with rkdevtool, here are some potential solutions to consider: rkdevtool no devices found

The device is not in the special low-level state required for the RKDevTool to detect it. This is a common stumbling block for new users. If you've done everything above and still see

The wrong USB cable, a faulty USB port, or insufficient power delivery can all disrupt the connection. a faulty USB port

If the serial log shows the device is resetting the USB bus due to DRAM errors, no software in the world will fix it. The board needs component replacement.