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You may find this article helpful with troubleshooting your Apple TV:
See if you are within the serial numbers described in this article:
If so, Apple will replace your unit for free. I just got a new one yesterday.
This bug is bigger than the subset of products described in the above article:
According to the document, affected units will have a serial number ending in DRHN, and the third and fourth characters of the serial number must contain one of these pairs: H9, HC, HD, HF, HG, HH, HJ, HK, HL, HM, HN, HP, HQ, HR, HT, HV, HW, HX, J1, J2, J3, J4, J5, J6, J7, J8, J9.
I don't have an AppleTV with those sequences and yet I'm having a similar issue - AppleTV thinks its connected via Ethernet (I've unplugged Ethernet) and despite a reset (can't restore because it can't get on the network) it does not see the WLAN in my house, and thinks its connected via Ethernet.
When I go into the Settings menu, Network shows Ethernet - despite that there is no Ethernet connection.
When I plug the Ethernet cable into it, and do a reset, it still has a self assigned address, and therefore does not see the network.
If not, what's the name of the other AppleTV-like product(s) on the market?
Anyone have any experience with it/them?
If I'm going to re-invest in supporting streaming content in my house, I'm thinking that I need to start weaning myself away from Apple, who doesn't take customer service as seriously as other companies - which is weird, because with this product, the vast majority of the content I'm consuming I pay Apple for - they have stickiness with my wallet.
You'd think that they would bend over backwards to keep me in their walled garden and not wandering over to Amazon or other streaming content providers.