Assistance with A603 carrier board for jetson nano orion nano 8gb on board SD card flashing

I’ve successfully flashed the Jetson Nano Orin 8GB board with the Nvidia SDK. However, after switching the carrier board to the A603, the USB ports stopped working even though the HDMI is functioning and the system boots up properly. How can I enable the USB ports?

My second question is, can I directly flash to an SD card instead of using the NVMe procedure outlined in the wiki? If yes, what are the command line instructions and procedure (excluding the mentioned SDK process)? Thank you.

Thank you.