Make example for this keyboard (after setting up your build environment):
- make jj40-program
+ make jj40:default:program
See [build environment setup](https://docs.qmk.fm/build_environment_setup.html) then the [make instructions](https://docs.qmk.fm/make_instructions.html) for more information.
done, just reflash the board with the original firmware.
2. Sometimes USB hubs can act weird, so try connecting the board directly
to your computer or plugging/unplugging the USB hub.
+3. If you get an error such as "Resource Unavailable" when attemting to flash
+ on Linux, you may want to compile and run `tools/usb_detach.c`. See `tools/README.md`
+ for more info.