Is it possible to manually update the antivirus signature databases and others on Firebox? By manually, I mean downloading the signature databases from WatchGuard servers and uploading them to Firebox.
@Bek This is possible for some of the subscription services (mainly Gateway AV and IPS.) This also requires our team set you up an account so you can retrieve the signatures.
If you'd like to do this, please create a support case and mention offline gateway AV signatures somewhere in the case. The support team can get that provisioned and ready for you.
WatchGuard Customer Support