Yaw yaw yaw

Kinda losing my mind. Been quad blind for months... today spent hours reading about capacitors... another hour or more trying to get Boss 7/Beecore back in the air.

It was stuck in the LOW D config, flying 46mn props. The Android BETAFLIGHT must have janked it. I changed it back, but it doesn't yaw now. What the fuck?
Android BETAFLIGHT might have fucked the config.
i AM FRIed.

Quads are a wonderful and exhausting puzzle.

UPDATE: 
Erased profile :no yaw
Flashed board:no yaw
Rebound TX to RX: yaw
Reinstate PIDS, PWM, motor stop, modes.
Boss 7 Airborne.

F