In a method of burning a firmware to an embedded device, a booting file is firstly created and saved in the firmware. The booting file includes a boot loader, a first kernel, a second kernel, a first initrd, a second initrd of a firmware, a rootfs, and an application program. The method burns the boot loader, the first kernel, the second kernel, the first initrd, and the second initrd in a flash memory of the embedded device. When the rootfs and the application program are recorded in a storage system of the embedded device, the method downloads the rootfs and the application program from a storage system of the embedded device, and burns the rootfs and the application program to a register of the flash memory.