Upgrade Notes:

1. This firmwareis only fit for W20Ev5.0 and its firmware version must be in V16.01.0.XX ormore.

2. Do not poweroff the device when upgrading.

3. Please unzipthe file you downloaded and use the file ended with "bin" or"trx" to upgrade your device.

4. Please resetit to factory settings after upgraded it.

Release Notes:

1. Fixed the issue that maintenance cannot work. 

2. Added Facebook Authentication.