1. This firmware is only fit for W20Ev5.0 and its firmware version must be in V16.01.0.XX or more.
2. Do not power off the device when upgrading.
3. Please unzip the file you downloaded and use the file ended with "bin" or "trx" to upgrade your device.
4. Please reset it to factory settings after upgraded it.
1. Fixed the issue that maintenance cannot work.
2. Added Facebook Authentication.