DJI E300 ESC issue setting up F550 w/ CC3D

[jet flyer]

I'm setting up my F550 using a CC3D board and when I go to the motor calibration part of the set up when I plug the battery in I immediately get the "abnormal signal" beeping. Using a DX8 with the regular receiver. I haven't been able to figure out what could be causing it

I also posted on the open pilot forum here: https://forums.openpilot.org/topic/56552-dji-f550-setup-problem/

 

[jet flyer]

So apparently the E300 ESCs don't have a BEC built in and that might be the issue, TBH would not have bought the ESC/ motor combo as I'm weary of DJI electronics if it weren't for my employee discount