Hi there, I actually like your challenge and I feel I have capabilities to help you. Your software has been submitted. 1x GND 3V3 (P2 with two pins 2.54mm) connector may be used to power externally the WCH CH569 MCU (it is suggested to eliminate the P4/SHUNT in that case https://hydrabus32097.ja-blog.com/33236023/top-guidelines-of-hydrabus