I am having a problem with my A3 PRO controller. I have installed everything and done all the setup using assistant 2 and all seams to be working fine with no errors. But when I power up the drone I get this constantly beep - beep – beep, one sec between them and it never stops and all motors do a little twitch at the same time. I can not run motor test on any motors from Assistant, they do not turn. I did try 5% 10% and 15%. And yes, I did select non DJI ESC´s. I am using LB2. Motors: T-motor U5.    ESC´s: T-motor Flame 80 HV.   

Ok, Ill just answer my own question. A3 does not output 5v from the ESC outputs and those ESC´s need them.
The solution if someone runs into the same, I added an SBECK with 5v connected the 5v ESC wire in each ESC.

Hi all. two days back i crashed my quard copter using a3 flight controller , after that number three moter not working and ese keep beeping . any solution,