How to change 1st boot device as a SD card in NVIDIA Jetson Nano System-on-Module

No, Jetson Nano is back! Availability for Jetson Nano Developer Kit (with 4GB memory) resumes Black Friday in the US, and worldwide in December.
See Jetson Nano and Jetson Xavier announcements - Jetson & Embedded Systems / Jetson Nano - NVIDIA Developer Forums