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Flashing bootloaders on AVR
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=== Target ATMEL chip pins === This will really depend on your chip/keyboard. If the keyboard designer was reasonably nice, you can find the (by now hopefully) familiar [http://www.evilmadscientist.com/images/articles/avrtargetboards_1.jpg 2x3 ISP header] somewhere on your PCB. If it's not there, you might end up soldering wires to MCU pins... Anyway, to check that the connections are correct, you should read you MCU type on the chip (usually atmega32u4, atmega32a or atmega32u2), google "{your-mcu-type} pinout" images, locate the SPI and RESET pins and check that they're connected where you think they're connected on the PCB.
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