After convincing myself that my newly purchased used 4K was not damaged in shipping after all and it’s erratic behavior may be because I didn’t read the instructions first(cost me a full blade set), I took a chance on flying with no gps. I put it up to about 5’ up and gently flew through my backyard. Only issue was a terrible drift back and right causing me to hold the stick severely forward/left just to maintain hover. But I still managed a nice circle before attempting a graceful 3 blade landing(yup, it tipped on me). No more flying now until more blades but I’m actually a bit relieved it actually responded to inputs. Next up is a visit to an expert to try it out and get the update connector repaired. Firmware is fine but I can’t run the GUI.