Despite all your tweak suggestions, iPad 3 is unable to connect to wi-fi after ios 6 update.

If you have tried "... all your tweak suggestions..." take your iPad to an authorized service center. You said you've tried them all so there is nothing more to suggest.

Some things to try first:

1. Turn Off your iPad. Then turn Off (disconnect power cord for 30 seconds or longer) the wireless router & then back On. Now boot your iPad. Hopefully it will see the WiFi.

2. Go to Settings>Wi-Fi and turn Off. Then while at Settings>Wi-Fi, turn back On and chose a Network.

3. Change the channel on your wireless router (Auto or Channel 6 is best). Instructions at http://macintoshhowto.com/advanced/how-to-get-a-good-range-on-your-wireless-netw ork.html

4. Go into your router security settings and change from WEP to WPA with AES.

5. Renew IP Address: (especially if you are droping internet connection)

• Launch Settings app

• Tap on Wi-Fi

• Tap on the blue arrow of the Wi-Fi network that you connect to from the list

• In the window that opens, tap on the Renew Lease button

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iOS 6 Wifi Problems/Fixes

Fix For iOS 6 WiFi Problems?

http://tabletcrunch.com/2012/09/27/fix-ios-6-wifi-problems/

Did iOS 6 Screw Your Wi-Fi? Here’s How to Fix It

http://gizmodo.com/5944761/does-ios-6-have-a-wi+fi-bug

How To Fix Wi-Fi Connectivity Issue After Upgrading To iOS 6

http://www.iphonehacks.com/2012/09/fix-wi-fi-connectivity-issue-after-upgrading- to-ios-6.html

iOS 6 iPad 3 wi-fi "connection fix" for netgear router

http://www.youtube.com/watch?v=XsWS4ha-dn0

Apple's iOS 6 Wi-Fi problems

http://www.zdnet.com/apples-ios-6-wi-fi-problems-linger-on-7000004799/

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Look at iOS Troubleshooting Wi-Fi networks and connections http://support.apple.com/kb/TS1398

iPad: Issues connecting to Wi-Fi networks http://support.apple.com/kb/ts3304

WiFi Connecting/Troubleshooting http://www.apple.com/support/ipad/wifi/

How to Fix: My iPad Won't Connect to WiFi

http://ipad.about.com/od/iPad_Troubleshooting/ss/How-To-Fix-My-Ipad-Wont-Connect -To-Wi-Fi.htm

iOS: Connecting to the Internet http://support.apple.com/kb/HT1695

iOS: Recommended settings for Wi-Fi routers and access points http://support.apple.com/kb/HT4199

How to Quickly Fix iPad 3 Wi-Fi Reception Problems

http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/

iPad Wi-Fi Problems: Comprehensive List of Fixes

http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/

Fix iPad Wifi Connection and Signal Issues http://www.youtube.com/watch?v=uwWtIG5jUxE

Fix Slow WiFi Issuehttps://discussions.apple.com/thread/2398063?start=60&tstart=0

How To Fix iPhone, iPad, iPod Touch Wi-Fi Connectivity Issuehttp://tinyurl.com/7nvxbmz

Unable to Connect After iOS Update - saw this solution on another post.

https://discussions.apple.com/thread/4010130

Note - When troubleshooting wifi connection problems, don't hold your iPad by hand. There have been a few reports that holding the iPad by hand, seems to attenuate the wifi signal.

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If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.

 Cheers, Tom 😉

My response was serious. You said you tried everything. If you were serious the only option left is to take it into an authorized service center for evaluation. If nothing has worked, as you stated, then the only possible explanation is a hardware failure. But do as you wish.

I have noticed a WiFi sync quirk associated with IOS-6. The computer's iTunes will recognize my iPod only if it is NOT connected to a charger. My iPad is original and is still on IOS-5. It functions properly.

I can temporarily resolve the issue by restarting my router (Airport Express). The problem returns if I log off/on my computer.