User manual

Appendix C – Firmware Upgrade Practices and Precautions
288
Appendix C – Firmware Upgrade
Practices and Precautions
Prior performing any firmware upgrade, it is important that you save a back up of your
existing configuration (see the Save/Restore section in the chapter entitled System) to a
local file.
While we make every effort to ensure your existing configuration continues working after
minor and patch revision upgrades, sometimes compatibility problems may arise.
For major upgrades, existing configuration is not maintained. A factory reset must be
performed and the SG unit reconfigured from scratch.
Note
SG firmware revision numbers have the form a.b.c, where a is the major revision number,
b is the minor revision number, and c is the patch revision number.
An upgrade where the major revision number is incremented is considered a major
upgrade, e.g. 2.1.5 -> 3.0.0. An upgrade where the minor revision number is
incremented is considered a minor upgrade, e.g. 3.0.2 -> 3.1.0. An upgrade where the
patch revision is incremented is considered a patch upgrade, e.g. 3.0.0 -> 3.0.1.
Warning
If the flash upgrade is interrupted (e.g. power down), the SG unit stops functioning and
becomes unusable until its flash is reprogrammed at the factory or a recovery boot is
performed. User care is advised.
After the upgrade has completed successfully and the SG unit is back up and running
with the new firmware, run through a few tests.
Ensure that Internet connectivity and any VPN connections can be established and pass
traffic, and that any configured services such as DHCP Server, Access Control or
Packet Filtering are functioning as expected.