Hello there, I really like your project and I do think I've expertise to assist you. Your software has actually been submitted. 1x GND 3V3 (P2 with 2 pins two.54mm) connector can be used to electric power externally the WCH CH569 MCU (it is recommended to eliminate the P4/SHUNT in that situation It is far from necessary given that the 3V3 LDO IC