Here+ v2 can problem

Hy Its about two weeks I am stuck with my here+ rtk . Actually I want to use external Barometer on my pixhawk2.4.8 .My problem is when I change the hardware switch to CAN mode my external compass is unable to detect,even no sign of barometer. I also saw whenever I change the hardware switch from I2C to CAN mode a bluish low rate blink starts. I am using new firmware 4.0.3

the manual says it disconnects baro+compass when using CAN