What I am using is RT106A board, I found there is no COM port after connected with USB cable.
There was following log message after J-link connected.
"Error: DAP error while reading DP-Ctrl-Stat register"
I tried to flash bootloader and bootstrap, after that, the error message gone, but still no COM port after USB connected.
With same bootloader and bootstrap image, it works on another RT106A board.
Do you have any suggestion?