USB Linker - frank26080115/Hydra-Dual-Brushed-Motor-ESC GitHub Wiki

A USB linker is required for firmware installation, updating, and configuration

NOTE: These are not typical USB-to-UART converters, these particular USB-linkers are designed specifically for communication with ESCs using half-duplex (one wire). Do not attempt to use ordinary "FTDI cables" or "USB to RS232" or anything that doesn't use half-duplex.

These might need USB drivers, here are links to the most popular USB drivers (depends on which linker you are using)