You can use a Double Male USB Connector to connect Remix Mini to a PC for debugging purposes.
1. Go to 'Settings > About > Build number' and click on it seven times.
2. Wait until the "No need, you are already a developer!" message pops up.
3. Go back to 'Settings > Developer options > Debugging', and turn on both 'USB debugging' as well as 'USB0 device mode enable'.
4. Plug the Double Male USB Connector into the upper USB port.
You are now ready to debug.