Hi Azreen
Well, before you go as drastic as all that, it seems my battery life problem is sorted.
I switched off the following:
- Automatic push/fetch mail - set it to manual only
- Location services
These are now hidden under Privacy settings. If you go to the very bottom of the Location settings screen you will see System Services. Most of these can usually be off. Only if you need map directions a lot and changes cities etc, you may need some. In fact, rather switch location setting off alltogether and when you need it, e.g. in maps, it will tell you to switch them on.
Rebooted the phone and all seems well.
Back to your original question.
I've never actually downgraded, but assume the process will be as follows:
If you made a backup of the phone earlier, I guess you could just try the Restore option first in iTunes.
Alternatively
- Download the 5.1.1 IPSW firmware file for your phone. (about 700MB)
Look for a trusted source on the internet. e.g. do a Google for "ipsw download 3gs 5.1.1"
Make sure you know where on your hard drive the file is stored
- Plug your phone into your computer with the USB cable
- In iTunes, select your phone one the left side of the screen
- On the rigth side of the iTunes screen look for buttons like Upgrade / Restore
- On my Mac computer I have to hold the 'options' key when selecting Upgrade which then lets me select the IPSW file I downloaded earlier. Unless I hold in the 'options' key, it will try to download iOS6 again, so be careful.
Not sure if this may wipe your contacts etc., so to be safe sync all of that to iCloud first.