1.Incorrect upgrade will damage your device.
2.Please upgrade your device by cable connections.
3.Do not power off the device when upgrading.
4.Only firmware version V15.03.06.X can be upgraded to this firmware.
5.Please unzip the file you downloaded and use the file ended with "bin" or "trx" to upgrade your device.
Tenda Technology Tower ,#1001 Int' l E-City Zhongshanyuan Road,Nanshan District, Shenzhen China 518052