I disagree, firmware updates have very little to do with security, maybe security of a device itself, but not the clients behind it. FortiGates will update signatures and bad IP lists and other things every 30min or so with FortiGuard subscription, or you can create custom feeds. Another HUGE security advantage of FortiGate is deep-packet inspection which Meraki can't do at all, given that over 85% of all attacks are encrypted.
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