Dragonboard410c is not work

I fatsboot a new bootimage in my board then the Blue LED all light
So what i can do to fix my board.

Which of the recovery methods have you tried?

According to the method of providing, show Waiting for QDL tty…
Can’t connect 410C normally.

I’d recommend trying the SD card method first.

If you have already tried that it is possibe that your board is broken. Are there any messages in the kernel log of your PC after you power on the 410C (use dmesg | tail to see that last 10 messages).