You need the following tools and software for the upgrade process. Except for Rufus, you can download the software from the Avaya Support site (https://support.avaya.com).
IP Office R11.0.4.8 server PC ISO file
The iso file name starts with "abe" followed by the version.
Rufus USB creation software
You cannot use the Avaya USB Creator software application for the R11.0.4.8 to R11.1.3 upgrade of PC-based servers. Instead, downloaded and use Rufus from https://rufus.ie/.
IP Office R11.1.3 server PC ISO file
The iso file name starts with "abe" followed by the version.
256GB+ USB memory key
PC server upgrades require a USB memory key of at least 256GB.
Keyboard, monitor and mouse
Whilst the upgrade process runs automatically following the server reboot, it is useful to see the progress.