sudo losetup -d /dev/loop0 Build a complete root filesystem inside the image.
dd if=uboot.bin of=firmware.img bs=512 seek=128 conv=notrunc Check vendor documentation for the correct offset. Before flashing, inspect the image: convert firmware zip to img
Example: Write uboot.bin to offset 64 KB (sector 128): sudo losetup -d /dev/loop0 Build a complete root
# Show partition table fdisk -l firmware.img sudo losetup -P /dev/loop0 firmware.img ls -la /dev/loop0p* sudo blkid /dev/loop0p* sudo mount /dev/loop0p1 /mnt && ls /mnt && sudo umount /mnt sudo losetup -d /dev/loop0 Step 6: Automate with a Script Save this as zip2img.sh for repeated use: convert firmware zip to img