Caddx turtle v2 + matek 4405 wing start/stop record on uart

I’m trying to turn on / off recording and the caddx turtle v2 camera in conjunction with the matek f 405 wing flight controller (firmware 4.1.0)
Camera connected to serial3
I configured everything according to RunCam Camera Support — Copter documentation

I see messages in the logs

RunCamControl LOW
RunCamControl HIGH
RunCam initialized, features 0x0009, 5-key OSD

But the camera does not respond when the recording toggle switch is turned on.

Moreover, as soon as I turn on SERIAL3_PROTOCOL = 26 (RunCam protocol). AMP starts to connect with the controller for a very long time. Sometimes after rebooting, I get a message that not all parameters were successfully read.