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Upload to board with no USB connection

The best solution is to solder back the connector or to buy a new board. Ways to use a board with ATmega32u4 without USB for development are: ICSP programming upload over a serial bootloader. Both ...
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Upload to board with no USB connection

Use a programmer, such as one based on CH341A that has pins broken out for CLK, CS, MOSI, MIOS [sic], GND, 3.3V, and connected those to pins on the Pro Micro as follows: Programmer Pro Micro CLK---...
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