Editing Converting NerD60 to TMK (section)

===Flash TMK firmware===
* Now you can write the TMK firmware, I have used the default keymap from tmk/nerd just to see that it works. I used FLIP (on Windows) to write the firmware. On Windows you need to install the ATm32U4DFU driver.
* How to use TMK is beyond the scope of this guide, but I have shared some sample keymaps just look further in this article.
* At this point the keyboard starts only in '''DFU''' mode (starts the bootloader instead of the firmware), I could test that the firmware is working by starting the application from FLIP (uncheck Reset).
* You can see that the keyboard is recognized :

    [  596.236048] usb 1-1: new full-speed USB device number 7 using uhci_hcd
    [  596.421099] usb 1-1: New USB device found, idVendor=feed, idProduct=6060
    [  596.421102] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
    [  596.421104] usb 1-1: Product: NerD
    [  596.421106] usb 1-1: Manufacturer: GON
    [  597.578507] input: GON NerD as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1:1.0/0003:FEED:6060.000C/input/input25
    [  597.578790] hid-generic 0003:FEED:6060.000C: input,hidraw0: USB HID v1.11 Keyboard [GON NerD] on usb-0000:00:1a.0-1/input0
    [  597.583386] input: GON NerD as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1:1.1/0003:FEED:6060.000D/input/input26
    [  597.583611] hid-generic 0003:FEED:6060.000D: input,hidraw1: USB HID v1.11 Mouse [GON NerD] on usb-0000:00:1a.0-1/input1
    [  597.589211] input: GON NerD as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1:1.2/0003:FEED:6060.000E/input/input27
    [  597.589408] hid-generic 0003:FEED:6060.000E: input,hidraw5: USB HID v1.11 Device [GON NerD] on usb-0000:00:1a.0-1/input2
    [  597.594226] hid-generic 0003:FEED:6060.000F: hiddev0,hidraw6: USB HID v1.11 Device [GON NerD] on usb-0000:00:1a.0-1
* Now, in order to make the keyboard start the firmware you have to change the value of the '''HFUSE''', don't mess around with the other fuses, you risk to break your board, unless you really know what you are doing!!! 
* I have set the '''HFUSE''' value to ''0xD9''.
* Just a side note : '''HFUSE 0xD9''' means : '''OCDEN''' disabled, '''JTAGEN''' disabled, '''SPIEN''' enabled, '''WDTON''' disabled, '''EESAVE''' disabled, '''BOOTSZ1''' enabled, '''BOOTSZ0''' enabled, '''BOOTRST''' disabled. While '''HFUSE 0xD8''' you have the same things as above with the exception of '''BOOTRST''' which is enabled(this was the default setting that came with the board from GON, and caused me a lot of grief). 
* Unplug the keyboard from the USB port and reconnect the ISP programmer. Again test a few times that you can really read the controller before you write anything, if you get warnings check the cables and find the source of the problem, don't go around forcing things!!!
 user@liz:~/Software/Teensy$ avrdude -c usbasp -p m32u4 -U lfuse:w:0xdf:m -U hfuse:w:0xd9:m -U efuse:w:0xc3:m -P /dev/USBasp
 
 avrdude: AVR device initialized and ready to accept instructions
 
 Reading | ################################################## | 100% 0.02s
 
 avrdude: Device signature = 0x1e9587
 avrdude: reading input file "0xdf"
 avrdude: writing lfuse (1 bytes):
 
 Writing | ################################################## | 100% 0.01s
 
 avrdude: 1 bytes of lfuse written
 avrdude: verifying lfuse memory against 0xdf:
 avrdude: load data lfuse data from input file 0xdf:
 avrdude: input file 0xdf contains 1 bytes
 avrdude: reading on-chip lfuse data:
 
 Reading | ################################################## | 100% 0.01s
 
 avrdude: verifying ...
 avrdude: 1 bytes of lfuse verified
 avrdude: reading input file "0xd9"
 avrdude: writing hfuse (1 bytes):
 
 Writing | ################################################## | 100% 0.02s
 
 avrdude: 1 bytes of hfuse written
 avrdude: verifying hfuse memory against 0xd9:
 avrdude: load data hfuse data from input file 0xd9:
 avrdude: input file 0xd9 contains 1 bytes
 avrdude: reading on-chip hfuse data:
 
 Reading | ################################################## | 100% 0.01s
 
 avrdude: verifying ...
 avrdude: 1 bytes of hfuse verified
 avrdude: reading input file "0xc3"
 avrdude: writing efuse (1 bytes):
 
 Writing | ################################################## | 100% 0.01s
 
 avrdude: 1 bytes of efuse written
 avrdude: verifying efuse memory against 0xc3:
 avrdude: load data efuse data from input file 0xc3:
 avrdude: input file 0xc3 contains 1 bytes
 avrdude: reading on-chip efuse data:
 
 Reading | ################################################## | 100% 0.01s
 
 avrdude: verifying ...
 avrdude: 1 bytes of efuse verified
 
 avrdude: safemode: Fuses OK (E:C3, H:D9, L:DF)
 
 avrdude done.  Thank you.

* Now disconnect the ISP and plug the USB cable, the keyboard should start in firmware mode and should work without any problems.
* The default keymap fotm GitHub has the following shortcut that can be used to access the bootloader : '''Left Shift + Right Shift + Fn-Y (Paus)''' (Fn is the Contextual Menu key on a 1.25u bottom row keyboard or the left Win key on a 1.5u bottom keyboard ). Or you can short the GND and RST pins on the PCB.