SnapGear 2.0.1 - Manual (Page 188)

Appendix D – Firmware Upgrade Practices and Precautions
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Appendix D – Firmware Upgrade
Practices and Precautions
Prior performing any firmware upgrade, it is important that you save a back up of your
existing configuration (Advanced
-> Store/restore all configuration files) to a local file.
While we make every effort to ensure your existing configuration will work with the new
firmware, sometimes compatibility problems will arise. You should be particularly aware
of this possibility when performing a major upgrade.
Note
An upgrade where the minor and/or major revision number is incremented is considered
a major upgrade, e.g. 1.8.5
-> 1.9.2, or 1.9.2 -> 2.0.0, whereas a patch upgrade
increments the patch revision number only, e.g. 1.9.0 -> 1.9.1, or 1.9.0 -> 1.9.2.
Warning
If the flash upgrade is interrupted (e.g. power down), the CyberGuard SG appliance will
stop functioning and will be 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 CyberGuard SG appliance 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.