hello, i built my very first fpv drone but when i wanted to configure it i got this error :

Mixer mode problem detected
The Quad X model needs 4 motor resources and the current configuration of the firmware provides 0 usable outputs(s) for the selected mode


I'm using a speedybee f405 v4 FC with a BLS 55A 30x30 (bought separately) I tried to reset the firmware but nothing works. 
When I go to esc-configurator and connect my fc, there's no motor. I've noticed that when I disconnect the ESC with the FC, it's as if I hadn't changed anything.
Thanks


EDIT :
finally, when I installed the firmware, I used the auto-find button and installed a firmware that wasn't correct (it wrote the right model but the options weren't right).