![]() I've only upgraded my iPhone so far, as I don't trust 4.3 to go on the other devices in my household! 4.2.1 was solid for me.I tried changing my router (which is on latest firmware) to have no wireless security key, disabled DHCP and used static ip on my phone, changed to 5ghz, reset the router, reset the iphones network settings, manually input the network details, deleted the ipsw file and restored my phone as a new one. I have a Linksys WRT320n router and has been faultless on N only, 2.4ghz for my iPhone4, iPad and my girlfriends iphone4. I upgraded my iPhone4 to 4.3 last night and it's killed my N only connection! This will erase all wi-fi network settings from your iPhone and require re-joining every wi-fi network you have access to when returning within range of such a network. My iPhone 4 updated with 4.3 last night was connected to my 'n' 2.4 GHz wireless network last night and which it is currently connected to now.If you are unable to connect to the network at all in order to select Forget this Network for the network followed by re-joinging the network, try resetting network settings at Settings General Reset. If its serial begins with any of these three letters, the method above will apply:VR0 (iPhone 2G Silver 4GB)WH8 (iPhone 2G Silver 8GB)0KH (iPhone 2G Silver 16GB)Y7H (iPhone 3G Black 8GB)Y7K (iPhone 3G Black 16GB)3NP (iPhone 3GS Black 16GB)3NR (iPhone 3GS Black 32GB)3NQ (iPhone 3Gs White 16GB)3NS (iPhone 3Gs White 32GB)A4S (iPhone 4 Black 16GB)A4T (iPhone 4 Black 32GB). But OS X Daily provides this handy list of suffixes, which will tell you whether your device employes the labeling system detailed above. You can find your serial number either on your iPhone’s box, or in the About menu within the Settings app.
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