How to fix when keyboard doesn’t work after uploading firmware

It’s due to several reasons.

1. Connecting it in wrong connection mode.
-> While holding down “U”, connect your keyboard.
(If you want to connect it in the mode “PS/2”, hold down “p”.)

2. Customized USB cable or improper USB hub.
-> Try other USB cable when connecting it. Some customized cable has bad electric flow.
-> Or connect it directly to the PC without USB hub. Some USB hub couldn’t supply enough electric power.

3. Wrong firmware

—>Upload new firmware.

  • While pressing Ctrl, plug your keyboard.
  • Open BootMapperClient
  • Go to tap “options”
  • At the bottom,  press Upload firmware.

Firmware is “ps2avrGB_NKRO.hex”, not the ones starting with “keymap_xxx”.
(For details, see http://blog.winkeyless.kr/183 )

4. Wrong USB Drive Installed.

—> Remove device drive(HID drive) from OS device manager and replug the keyboard
If you install it properly, it looks like this.

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5. Hardware broken… expecially bad soldering if it’s new PCB.(Quite a rare case)

—> Please see http://winkeyless.kr/soldering-guide/

 

6. If it doesn’t help, please visit this to test in-depth.
( http://winkeyless.kr/how-to-check-a-pcb-is-working/ )

7. Blank Keymap.
Sometimes a user upload a blank keymap file after opening BootMapperClient.
If you click the button “Upload” without any key map data in cells,
your keyboard won’t function.

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1) Just click the button labeled “Load keymap_part.hex or .json”
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2) Select your keymap hex file.
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 3)  When you see the cells filled with chars,
then press the button “upload”.
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4) Replug your keyboard.
(If you checked the box “Rebbot after uploading” next to the “Upload” button,
you don’t have to replug it.)