Lancom R&S Unified AGPO150 Migration Manual page 15

A If your current software version is still older than version 9.4, repeat the
above steps from step 2.
As soon as you have upgraded to version 9.4, you can continue with
the steps in the chapter "Upgrading the LANCOM R&S®Unified Firewall
from versions 9.4 and 9.5" on page 10.
If the upgrade fails or the device reboots and the old version is still installed,
you will find further information in the log files.
14
LANCOM Installation Guide – Upgrade procedure