An USB isolator will help reduce ground loops and cuts down electromagnetic interference (EMI) among the pc as well as the related system. 1x GND 3V3 (P2 with two pins two.54mm) connector can be used to electricity externally the WCH CH569 MCU (it is usually recommended to remove the P4/SHUNT https://keeganiasjz.thechapblog.com/32337467/hydrabus-no-further-a-mystery