Upgrading from SD card may be suitable if you have many phones to upgrade. The phones do not have to be connected to the network.
You can press any other button than 1, 2, or 3 to start the phone without any change.
The Avaya B179 is upgraded with the firmware file on the SD card and starts when the upgrade is done.
If DHCP is used in the network, the IP address may have been changed. If the web browser loses contact with Avaya B179, check the IP address on the conference phone.