STEP 1: Flash FW Betaflight 3.2 RC4 or higher
Download Betaflight 3.2 RC4: https://goo.gl/hvsuXD
STEP 2: Go to CLI tab, and paste this strings:
Resource LED_STRIP none
Resource CAMERA_CONTROL 1 B07
Camera_control_mode = HARDWARE_PWM
Camera_control_ref_voltage = 330
Camera_control_key_delay = 180
Save
Then press ENTER, FC will auto save and reboot