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[Keyboard] Jj40 doc (#4914)

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* Update README.md

* Update README.md

* Update README.md

* Update README.md
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wanleg 2019-01-30 11:03:04 -08:00 committed by Drashna Jaelre
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@ -69,3 +69,16 @@ Windows sometimes doesn't recognize the jj40. The easiest way of flashing a new
3. If you get an error such as "Resource Unavailable" when attemting to flash 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` on Linux, you may want to compile and run `tools/usb_detach.c`. See `tools/README.md`
for more info. for more info.
## Recovery
If you flash a bad hex (e.g. you have a V1 board without RGB and compile/flash blindly without editing your rules.mk), your jj40 is now semi-bricked and you're stuck unless you have access to an ISP. The [ISP Flashing Guide](https://docs.qmk.fm/#/isp_flashing_guide) contains very good (but somewhat generalized) information. However, the instructions below should get you up and running provided you have an Arduino or clone.
### Arduino Setup
1. Upload the ArduinoISP sketch onto your Arduino board (https://www.arduino.cc/en/Tutorial/ArduinoISP).
2. Wire the Arduino to the jj40. Match the data pins on the Arduino to those on the jj40. "RST" usually goes to D10 on the Arduino. I didn't need a capacitor when using my Uno.
![Imgur](https://i.imgur.com/oLWJOkQ.jpg)
3. Get a working bootloader from https://blog.winkeyless.kr/m/152. The file is called "main.hex" from the archive called "ps2avrGB_bootloader_161215.zip" Copy "main.hex" to your qmk folder.
4. Burn the bootloader with the following command
` avrdude -b 19200 -c avrisp -p atmega32 -v -e -U hfuse:w:0xD0:m -U lfuse:w:0x0F:m -U flash:w:main.hex:i -P comPORT`
Change `comPORT` to whatever port is used by the Arduino (e.g. `com11` in Windows or `/dev/ttyACM0` in Linux). Use Device Manager in Windows to find the port being used. Use `ls /dev/tty*` in Linux.
5. If this process is successful, you should now be able to upload normally.