Following is the current status of FOTA server.
For FZ-A3 only, there is the issue that the software update via FOTA server sometimes will be failed.
If the software update via FOTA server is failed you will download FZ-A3 System software at "2.System Software Update" site and update it.
This software update issue is resolved from build number(16-01-100-103) firmware.
The FOTA service using the TLS1.1 protocol terminated due to the security policy change in FOTA server.
As a result, it was no longer available to update the system software using FOTA for the following models.
Service end date: March 31, 2021
Some message may be displayed after FOTA service termination.
See "this page" for more detail and setting to avoid the message.