====== Using mtd to upgrade firmware ======
  * Login to Carambola and download binary image to RAM. (Alter IP and path to match your binary image location)

  scp test@192.168.0.104:/home/test/carambola_tester/bin/ramips/openwrt-ramips-rt305x-carambola-squashfs-sysupgrade.bin /tmp

  *  Perform upgrade procedure.

  mtd -r write /tmp/openwrt-ramips-rt305x-carambola-squashfs-sysupgrade.bin firmware