I tried today to update the firmware on my USB AVR Programmer (Pololu item #: 1300) using this guide:
Everything proceeded as normal, until I pasted in the firmware (using screen on Ubuntu 18.04). Instead of receiving the pipe character, I received a lowercase h. The red LED is blinking slowly. When I unplug and try again, it starts up in bootloader mode, but I keep getting the lowercase h and am unable to proceed.
Any ideas as to what’s going on, or what the “h” indicates? Thanks!