1.Incorrect upgrade will damage your device.
2.Please upgrade your device by cable connection.
3.Only firmware version H3_V3.X.XX can be upgraded to this firmware, but it can not be upgraded back to H3_V3.X.XX.
4.Do not power off the device when upgrading.
5.Please unzip the file you downloaded and use the file ended with "bin" or "trx" to upgrade your device.