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Help! First build DYS F4 Pro v2 blheli esc problem

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!!


Wake up! Time to fly!
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.