So I have tried everything I can think of, still no luck. On 4.2.2 I tried the Servo_blh_test parameter, in the console window it says esc tested ok for each of the three. I am at a loss. Reset all parameters and reloaded, looked through them for anything odd. Set the blh mask to just the three aux channels the escs are plugged into still no joy. Revert back to 4.1.7 and all works like a charm. Edit :After resetting all the params and reloading I did get servo7 to stay disabled.
SOLVED !! . So going through the servo settings again I noticed another non Aux channel set to a motor for some reason. I changed it back to 0 and as well as servo 7 being back to 0 and updated to 4.2.2 and all working as it should now. Appears that 4.2.does not like any of the non AUX ports being set to a motor when using bdshot, where 4.1.7 tolerated it. Thanks for all the help troubleshooting.
Cheers
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