How to burn caterina bootloader to Adafruit ItsyBitSy 32u4 5V 16M with Arduino as ISP

Burn_Caterina_Bootloader_to_ItsyBitsy

# Requirement :
- Arduino UNO
- blocked Adafruit ItsyBitsy
- some wiring cable
- avrdude

Tested on Archlinux with avrdude 6.3

1. upload Arduino as ISP sketch to an Arduino UNO
2. wire Arduino UNO to ItsyBitsy as follow :

Arduino | ItsyBitsy
5V      | 5V
GND     | GND
10      | RST (reset)
11      | MOSI
12      | MISO
13      | SCK

3. download Caterina bootloader (You can try to upload Arduino bootloader, but it won't work :-) ).
from here https://learn.adafruit.com/introducting-itsy-bitsy-32u4/downloads

4. Setup fuse for programming with : 
avrdude -c avrisp -P /dev/ttyACM0 -b 19200 -p m32u4 -U lfuse:r:low_fuse_val.hex:h -U hfuse:r:high_fuse_val.hex:h

5. Upload bootloader with
avrdude -c avrisp -P /dev/ttyACM0  -b 19200 -p m32u4 -U flash:w:Caterina_itsybitsy5V.hex

NOTE : with Arduino as ISP programmer, you should use "avrisp" with avrdude AND baudrate of 19200

Also worked fine with Leonardo copied / Mac book pro.
You save me.
thx!