https://qooah.com/2014/07/16/mtk-%e9%80%8f%e9%9c%b2%e8%b6%85%e5%bc%b7-64-bit-%e5%85%ab%e6%a0%b8%e5%bf%83%e8%99%95%e7%90%86%e5%99%a8-mt6795/