Apple TV(3) No longer connecting/locating ANY wireless networks

Hi all,
I recently purchased a Motorola modem and replaced it with a rented one form comcast, and for some reason my Apple TV is no longer able to connect to either my network (via an airport express and Comcast connection) or locate any other wireless networks in our area. I live in an apartment complex, so it should be able to see quite a few.
Here is what I have tried so far:
1. Restart Apple TV
2. Reset (not restore) Apple TV
3. Reset airport router
4. Reset modem
5. Un-plug/re-plug coax (internet) cable from the wall
6. Relocate the Apple TV within my electronics set-up
I don't have an extra Ethernet port on my modem, so I have yet to try hard wiring the Apple TV as it would require disconnecting the Internet.
Any ideas???

Welcome to the Apple Community.
There has been a recall of a small number of Apple TV 3 units that are unable to detect wifi. Please provide the 3rd and 4th characters of your serial number, as well as the last 4 characters, I’ll check if it is on the recall list for you.
Your serial number can be found at settings > general > about, if you can access it, or on the box or the device itself (quite small).
Alternatively you can contact an authorised reseller or you can also contact your nearest official retail store to check for qualifying models. You should note that all Apple TV models are not eligible for the replacement.

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