Upgrade Notes: 

1. This firmware is only fit for AC23 and its firmware version must be in V16.03.09. XX or more. 

2. Do not downgrade to lower version. If do, it will not allow to change the configurations even damage the router. 

3. Do not power off the device when upgrading. 

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

5. Please reset it to factory settings after upgraded it. 

Release Notes: 

Optimize some known problems.