HT201401 how to install ios version 5.1.1

my iphone 3gs automatic lock screen and reboot i can't do anything untill low battary show down after chaching allso same...

If I install it and it is too slow, can I uninstall?
Not according to Apple. But truthfully it can be done and without jailbreaking. You do need to prepare for the regression before you do the update to iOS 5 though.
You may also be able to update your current 4.2 to 4.3. You can download 4.3 (be sure to get the correct one for your iPad) from the direct links here;
After you have the file on your computer open the iTunes app on your computer, press & hold opt/alt and click the Check for Update button. Browse to the 4.3.5 file on your computer and select it. iTunes should take care of it from that point forward.

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