No network LAN-connection after iOS 5.1.1update

Today i tried to solve a big issue after updating my AppleTV's to 5.1.1 (actual version: AppleTV3,1_5.1_10A406e_Restore.ipsw). After updating my Apple TV´s, they could not connect to the Apple activation server. No Home Sharing was adjustable and also logging in iTunesStore was not possible. The update I have done via LAN cable, and I changed nothing in my network configuration. The network (networkadress via DHCP) is indeed set up by default in the AppleTV automatically. Nevertheless, nothing went. Then I removed the network cable and made a reset of the AppleTV and tried to connect via Wi-Fi. With Wi-Fi, he finds the activation server and everything works as it should. Home Sharing, iTunes, streaming. However, once the network cable is plugged in and the Apple TV is restarted, it is again not possible to get access the iTunesStore. Home Sharing is not possible. The networkcable are fine. Both MacBook, as well as my TVs have internet connection over the same network cable. If I unplug the network cable from the AppleTV again, anything goes. Only via WLAN, but it's just too slow to stream data from my Mac. I have this "strange behavior" on 3 AppleTV 3.Gen., which are in the apartment. The previous iOS-Version on the same network cables, worked great. Can anyone reproduce the problem? Or have I now 3 bricked devices? I tried to downgrade over itunes. But this is not possible anymore. I installed 3 times the update. But nothing goes. Please can anybody help me.

I found another link titled "Apple TV Death after update" and found several links that have proven to work to restore to the previous version. Here is my post:
"I had originally replied to a post titled "No network LAN-connection after iOS 5.1.1 update". That has been my issue after updating to 5.1. Wirless worked for me but iTunes match and Podcasts were slow to respond. I finally downgraded to the previous version (5.0.2). So far, my ATV3 has been operating exactly as it did out of the box. No more activation failed message, and all components of ATV are functioning flawlessly on my whole home LAN network.
I also wonder what Apple was thinking for releasing this update without adaquate testing. I can forgive them for Maps, but not this. ATV has been around long enough for all of the kinks to be worked out and any updates to just plain work. I did like the new menu displays in apps and how you could rearrange the program icons on the home screen.
Perhaps they will get it right. Some day. But until they show proof that any future updates are correct and provide detailed instructions on how to revert back to a previous version, I will be very leary of updating. Spending a week reading message boards on how to do a simple resotre is not my idea of how to spend my weekends.
As a side note, I am a PC, so to restore from an .ispw file located on your system, you must press the Alt & Shift keys togather, then click the Restore button, and a window will pop-up so you can select the location for the restore file."
Directions to restore:
"Yes you can. I am a PC. Download the .ipsw file and save to your desktop. Unplug the LAN, HDMI and power cable. Connect the usb cable from your laptop to the ATV. If iTunes does not automatically launch, start it. After iTunes is running, plug in the power cable to the ATV. iTunes will recognize the ATV and will open the restore window in iTunes.
Press the Alt and Shift keys togather, then click on the Restore button. A file window will open so you can navigate to the desktop (or where ever you saved the file). Select the AppleTV3,1_5.-.2_9B830_Restore.ipsw file. iTunes will start the restore process.
When you see the message that it has completed the restore, unplug the usb cable and power cable. Reconnect the LAN and HDMI cable then plug in the Power cable in that sequence.
Follow the setup procedure again and all should be as it was before."

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Private info removed as required by the Terms of Service.
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