RESOLVED: New build F450 - APM2.8

Hello guys, 

I´m currently working on a new build, this time an F450 with APM2.8 (https://www.aliexpress.com/item/F450-Qua...0.0.JpECQO)

I noticed that this board has been retired when I try to flash the latest firmware, it´s ok as FlightPlanner app goes for the latest available FW for this board and the FW upload works just fine.

The problem here is: I cannot calibrate the ESCs after wiring them all.
When I click on ESC calibration I get the message: "Set param error. Please ensure your version is AC3.3+"

When I try to test the motors then I get a different error: "command denied by autopilot"

Any clue what could be happening ?

Thanks

EDIT: I figured out, it requires radio configuration before going to test motors, and calibration has to be done through the radio (high throttle + connect battery).