did you spill water on it?, i have that problem when a short happen on the usb data lines or on some usb ports on my old laptop that are just worn out (making bad contact). so maybe before going to the effort of buying a programmer and/or flashing try with an other cable (and if you did sorry then but reflashing might be a good next step if you do not nee any burn marks/lifted pads on the usb connector), and if your keyboard is not recognized as a usb device you will most likely not be able to flash it on usb. you may be able to use a teensy as an isp, i never tried
Last month I was using this keyboard for my programming job in my office. I picked up a phone call and after that I returned to programming. At this moment, I got a static electricity shock from the keyboard (the metal case). After that, the keyboard starts to malfunction.
I disconnected the USB cable and reattached it again. It shows "One of the USB devices attached to this computer has malfunctioned, and windows does not reconginze it" under windows 8.
I went to buy a new mini USB cable and plug it to test again, it doesn't work. I plug it to other desktop / notebooks with the new cable / old cable, it doesn't work either.
I am going to buy a tennsy and try to get into the bootloader mode. Please kindly help which software and which version of firmware should I use for this PCB.
It is LZ-F keyboard.
Thanks in advance.