Vinny! You're the man! Good news but a little backround first. I've been building drones for a long time, but I come from the "Other side" using a windows box to configure APMs then Pixhawks with Arducopter using Mission Planner. When I got this thing, I literally built an Ubuntu workstation just to talk to it. I'm an old guy that used to live on the DOS commandl line, but I really have to hone my Linux skills (almost nonexistent..) for this project. Outside of the Arduino IDE and some ancient BASIC, I'm no coder, but I understand microcontrollers, serial, I2C, CAN etc pretty well because I come from an industrial automation background. (Amazon Fulfillment Center Controls lead configuring Cognex and Sick every day..) I figured out the serial ports. (I was using the freaking asterisk in the QGC parameter search box like a typical DOS jockey!) I found that in the 1.11.3 firmware the serial parameters are bit masks and numeric with no real reference for me, but in the latest PX4 release they have a dropdown and real names and values, so I loaded it, changed TELEM1 to 921k and Mavlink mode 2 (offboard), saved the params, then loaded your 1.11.3 custom version back up and restored the params. Done deal. Now I just need the level shifters I ordered today and I can try it out. BTW I also ordered two connector kits, one with a pile of GH 1.25's and the other with a pile of DF13's. I've been meaning to get them for a while cause' I have a huge collection of parts that just don't quite match up and also because I wear my super-re-pinner badge proudly! I'll let you guys know how the level shifters work. I ordered two types, one with multiple mosfets and one with the TXS0108E chip so I can see what works best when it goes back together. Thanks for your prompt and helpful reply!