Q: A5X in iPad 4

iPad 2 have A5 CPU.

iPad 4 have A6x CPU.

http://www.apple.com/ipad/compare/

Try update router firmware.

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 Issue https://discussions.apple.com/thread/2398063?start=60&tstart=0

How To Fix iPhone, iPad, iPod Touch Wi-Fi Connectivity Issue http://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