Drone wont arm motors - betaflight FC MAMBA f405 MK2

hello everyone

i have problems with my new fpv quad that i ve just built… i use a flysky FS-I6X and from receiver tab all seems to work correctly.
in fly mode i set AUX 1 for ARM function and when i move the switch it slides right, but the ARM square doesn’t become yellow and nothing happends…

i followed various checklists found online but… normal check seems to be ok in my case…

can someone help me please?


It wont arm when plugged into betaflight safety thing. as long as when you move switch it goes in correct area and the throttle is not set to high it will arm.