Flashing

Two distinct workflows are involved in getting firmware onto the device:

1. Bootstrap — load a temporary, RAM-only image over USB FEL the very first time the board sees power, so you can talk to it through a USB Ethernet gadget and a serial console.
2. Flashing — from that running bootstrap (or from any working system), write the SPL/U-Boot to mtd0 and the rootfs to the rootfs UBI volume.

Each workflow has its own page:

• Bootstrap — initial load via sunxi-fel
• SPI NAND flashing — flashcp for the bootloader, ubiupdatevol for the rootfs
• ESP32-C3 flashing — companion firmware

Cable: a single USB-C cable is enough for both flow steps — it provides power, USB FEL access, and the USB gadget Ethernet link.