HT2404 My iphone 3gs recently stopped allowing me to use certain apps and refuses downloads of other apps, saying all require ios 5. No software update button appears in settings.Can I update/upgrade my 3gs to ios 5?

My iphone 3gs recently stopped allowing me to use certain apps and refuses downloads of other apps, saying all require ios 5. No software update button appears in settings.Can I update/upgrade my 3gs to ios 5?

iOS 5: Updating your device to iOS 5 or Later
http://support.apple.com/kb/HT4972
How to install iOS 6
http://www.macworld.com/article/2010061/hands-on-with-ios-6-installation.html
iOS: How to update your iPhone, iPad, or iPod touch
http://support.apple.com/kb/HT4623
If you are currently running an iOS lower than 5.0, connect the iPhone to the computer, open iTunes. Then select the iPhone under the Devices heading on the left, click on the Summary tab and then click on Check for Update.
Tip - If connected to your computer, you may need to disable your firewall and anitvirus software temporarily.  Then download and install the iOS update. Be sure and backup your iPad before the iOS update. After you update an iPad (except iPad 1) to iOS 6.x, the next update can be installed via wifi (i.e., not connected to your computer).
 Cheers, Tom

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