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Help! First build DYS F4 Pro v2 blheli esc problem

#1
Hi all,
I am in the process of building my first quad and have hit a snag. Total newb but learning quickly!
All went well as I was following along with the Flite Test FT 270 build video until it came time to flash the ESCs. Flite Test E-Pack 2 (Lumenier 2206 2000kV/ Lumenier BLHeli 30A ESC). DYS F4 Pro. 2 FC. For whatever reason the #3 esc wouldn’t flash. After reconnecting a couple of times I was able to flash it but it wouldn’t write. Checked my solder connections and they appear ok but now I’m not able to see my #3 esc at all in blheli configurator. Side question, if one esc or motor is bad will that prevent the other 3 from operating in beta flight motors?
Thanks for any help!!
 

PsyBorg

Wake up! Time to fly!
#2
Do you have signal AND ground to the esc's or just signal? Some systems are picky specially when flashing about having its own ground.