Wifi: no hardware installed, after latest yosemite security update

I just applied Security Update 2015-002 (at the behest of Software Update), along with the Command Line Tools (OS X 10.10) v6.2 update, and after the mini rebooted, it now says Wifi:No Hardware installed. And when I go to Network and Hardware in System Preferences, it gives a preferences error. I have tried resetting the NVRAM and the SMC, to no avail. Anyone else have this issue?

In some cases, this issue is caused by a hardware fault. A loose connection, a short circuit, or a microscopic break in a solder joint may open and close depending on temperature, making the failure intermittent.
Test after taking each of the following steps that you haven't already taken. Back up all data before making any changes.
1. Turn off Bluetooth. If you have a desktop Mac, you'll need a wired keyboard and mouse to take this step. Those are useful to have anyway, because Bluetooth is not completely reliable. If Wi-Fi works with Bluetooth turned off but not when you turn it back on, delete all pairings in the Bluetooth preference pane and recreate them. Restart the computer and test again.
2.. There are a few reports that the problem was solved by unchecking the box marked
          Wake for Wi-Fi network access
in the Power Adapter tab of the Energy Saver preference pane. I can't confirm.
3. Reset the NVRAM.
4. Reset the System Management Controller.
5. Start up in Recovery mode. In the menu bar of the OS X Utilities screen, there's a Wi-Fi menu. Try to connect.
6. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

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