Thank you for your reply.
I changed the defconfig, but it is not operating too.
(Firmware - nuttx-configs - px4fmu-v4 - nsh)
In addition, I changed the clock in board.h and ld.script configuration for STM32F446.
(My board is operating with 8 MHz OSC)
I connected alomost every UART port and it was not operate.
I think, there is a problem in PX4 F/W, so I cannot find at device manager. (Just can see bootloader)
I don’t know what should I do anymore.