Yealink VC400, Administrator'S Manual

Page: 289 / 299

Troubleshooting
273

Upgrade firmware

Configure some features need to take effect after a reboot
You can reboot the system in the following ways:

Long press the power button on the VC400/VC120 codec.

Select
Menu
->
Advanced
(default password: 0000) ->
Reboot & Reset
->
Reboot
, and
then press .

Login web user interface and click on
Setting
->
Upgrade
->
Reboot,
and then click
Confirm
.
To avoid corrupting the system, you should not unplug the power adapter from the system to
power off the system.
Why does the system fail to upgrade?

Ensure that the firmware is different from the firmware currently in use.

Ensure that the downloaded firmware applies to the system.

Ensure that the system is powered on normally, and the network is available during the
upgrade process.

When upgrading firmware via web user interface, ensure that the web user interface is not
refreshed or closed during the upgrade process.