DYS XSD 30A V2 BLheli-s esc PWM issue with PX4

After passing all the basic setup’s in MP I tried to run up the motors but they only get to about 15%.
I had a look at the pwm signal out of the PX4 with an oscilloscope and can see the motors start at about 50% duty cycle then as I increase the throttle the speed increases slightly and they stay at that speed even though the throttle is at max and the duty cycle is at about 90%.
So I have throttle range but the esc’c don’t respond. I have flashed esc’s to the latest firmware.
Also I can’t get passthrough to work as well, maybe related to the esc’s?
I must be missing something somewhere.
Has anyone had this type of problem.

What autopilot and firmware are you using?

Hi, PX4.2.8 and Arducopter V3.6.3 Hexa is that what you mean by firmware.

G’day Ian,
Thanks: it’s worth checking, because some hardware (like yours) is mislabeled by the manufacturer.
For help with ArduPilot and Missionplanner setup you’ll need to visit discuss.ardupilot.org
If you’re using PX4 firmware on your Pixhawk flight controller, the community here can assist.

Ok I see thanks for the info I’ll give them a go.