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- # jj40
-
- ![jj40](https://ae01.alicdn.com/kf/HTB18bq6bOERMeJjSspiq6zZLFXar.jpg?size=359506&height=562&width=750&hash=663a22d0109e2416ec8f54a7658686da)
-
- A compact 40% (12x4) ortholinear keyboard kit made and KPRepublic on AliExpress.
-
- Keyboard Maintainer: [QMK Community](https://github.com/qmk)
- Hardware Supported: Atmega32A
- Hardware Availability: [AliExpress](https://www.aliexpress.com/store/product/jj40-Custom-Mechanical-Keyboard-40-PCB-programmed-40-planck-layouts-bface-firmware-gh40/3034003_32828781103.html)
-
- Make example for this keyboard (after setting up your build environment):
-
- make jj40-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.
-
- Note that this is a complete replacement for the firmware, so you won't be
- using Bootmapper Client to change any keyboard settings, since not all the
- USB report options are supported.
-
- In addition you may need the AVR toolchain and `bootloadHID` for flashing:
-
- ```
- $ brew cask install crosspack-avr
- $ brew install --HEAD https://raw.githubusercontent.com/robertgzr/homebrew-tap/master/bootloadhid.rb
- ```
-
- In order to use the `./program` script, which can reboot the board into
- the bootloader, you'll need Python 2 with PyUSB installed:
-
- ```
- $ pip install pyusb
- ```
-
- If you prefer, you can just build it and flash the firmware directly with
- `bootloadHID` if you boot the board while holding down `L_Ctrl` to keep it
- in the bootloader:
-
- ```
- $ make jj40
- $ bootloadHID -r jj40_default.hex
- ```
-
- ## Troubleshooting
-
- 1. Try plugging the board in while pressing `L_Ctrl`. This will force it
- to boot only the bootloader without loading the firmware. Once this is
- 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.
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