Help > Functions and applications > Firmware Update
Firmware Update
When firmware is updated, errors are corrected or new features are installed. To do this, the device establishes a connection to a server in order to download the most current firmware (the device settings remain intact).
*Note: If you have just performed a firmware update and an error message appears when you log into the web interface, please empty your web browser's cache or wait for about five minutes before logging in again.
*Note: Some of the functional upgrades provided as part of a firmware update require additional configuration parameters. Sometimes not all these parameters can be determined automatically from the previous firmware version. This is why you need to edit some parts of the configuration manually in this type of update.
*Note: After a firmware update, you usually require a new version of the instructions.
*You will find the up-to-date instructions on the Internet under Auerswald Support/FONtevo Support.
When an instant firmware update is activated via the update server, the firmware update is initiated automatically. A connection to the update server is set up and then the server sends the latest firmware to the PBX.
*Important: For the update service, the COMtrexx requires access to the update server. Make sure that the address and port are reachable.
*Further help under Network
*For more information on data exchange with the update server, take a look at the Privacy Policy of the COMtrexx. You will find this in the Internet under: Auerswald Support/FONtevo Support or here: Dashboard > Status information > Legal > Data protection
Telephones of the COMfortel D-series 
Telephones of the COMfortel D-series are supplied with updates from the update server even without their own Internet access. For this purpose, the update via the COMtrexx is provisioned as an update server URL for the telephones.
d-series_template.xml
<update>
<url>http://$(sip.server)/fwupdate</url>
</update>
*Note: However, if this change is not to be made, for example because a separate update server is used for the telephones, an individual provisioning file with a customised update server URL may need to be created for this purpose.
*Further help under Provisioning
Other requirements for firmware update via update server 
Requirements for firmware update via update server and for the search of firmware updates:
•PBX connected to broadband Internet access
•Configured DNS server and, if necessary, an HTTP proxy server
•Configured gateway
*Further help under Network
Configuration 
Firmware update options:
•Manual Firmware Update
−Administration > Maintenance > Update and Restart > Store firmware in the PBX
•Firmware update via update server
−Administration > Maintenance > Update and Restart > Firmware update via update server
•Restoring firmware
−Administration > Maintenance > Update and Restart > Restart
Alternative function by pressing a key on the COMtrexx Business
•Restoring firmware
*Description of operation under Button functions COMtrexx Business
Alternative function by pressing a key on the COMtrexx Flex
•Restoring firmware
*Description of operation under Button functions COMtrexx Flex
Alternative function by pressing a key on the COMtrexx Next
•Restoring firmware
*Description of operation under Button functions COMtrexx Next
Alternative functions on an internal/external phone
•Initiating an automatic PBX update
*Description of operation under Firmware Update