Missing /dev/ttyTHS1 for UART0 (uartb) on NVIDIA Jetson Orin NX

Just like I mentioned above, Orin NX+p3509 carrier board is not supported to be flashed with SDK Manager. Please use initrd flash script instead.

Do you mean that you flash the Orin NX + p3059 with SDK Manager successfully?
Is that the another board different from the failed one? Please help to provide the flash log.