http://nwcom.info/Driver/oem/WM8850-mid/FW/Tools/Amlogic%20tablet%20upgrad%20tool/Amlogic%20%20tablet%20upgrading%20tool%20guide_121011.docx
http://nwcom.info/Driver/oem/WM8850-mid/FW/Tools/Amlogic%20tablet%20upgrad%20tool/USB-upgrade-tool.rar