Couldn't you also just link the two via TX/RX and reset lines, reset the target and read and transfer a Hex file from an SD card, via the target bootloader?That would require the equivelent code as the AVRDUDE PC based program that knows how to talk to the bootloader. Maybe not impossible but I haven't seen anything trying that method, ICSP is the normal method used.That's an idea we had for allowing a user to perform a firmware update on our devices, although we've not tested it yet.
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