An USB isolator can help get rid of floor loops and reduces electromagnetic interference (EMI) amongst the pc as well as the related gadget. 1x GND 3V3 (P2 with 2 pins 2.54mm) connector can be employed to energy externally the WCH CH569 MCU (it is suggested to eliminate the P4/SHUNT https://codylnmkf.wikibyby.com/1271504/detailed_notes_on_hydrabus