@lastblade2 Alas, the Stick has been depreciated now and the Stick C and V and the current versions but the Stick V is not supported in UIFlow due to it unique features and lack of wifi.
We are very sorry, I test it, found M5GO Bottom will affect gps module, it make uart high level only 1.5v you can try use do this， connect TXD to 34 then Knife cutting TXD to 16, and change code GPSRaw.begin(9600, SERIAL_8N1, 34, 17);
You need an external isp. If you have one of the Arduino products you can use them as a programmer via a program that is part of the default Arduino libs. For my servo module I use an Arduino 328p-pu which is the dip version and so I can just swap the ATmega chip out of the Arduino board and program it normally from arduino
