You need the sh files to downgrade.
SOURCE: my iphone 3gs willnot on and not show me the apple logo
Instead of trying to update when you connect to iTunes you should try to restore the phone completely.
You can find the restore button in the lower right hand corner of your screen. If iTunes asks if you want to update click cancel. You just want to restore.
If it is still not turning on after it reappears in iTunes you should take it to Apple if it is still under warranty they will exchange it for you.
SOURCE: restore iphone 3gs problem
Your iphone might already have that version, or maybe the phone does not have service, or also it could be tht the phone has been jailbroken. try doing a reset by holding the home buton, and power button down at the same time until the apple logo appears. Then try again
SOURCE: my iphone 3gs has no sim in it and is disabled,
Try This: If I could be of further assistance, let me know. If this helps or solves the issue, please rate it and give a testimonial for my response Thanks, Joe
1. Remove Sim Card
2. Hold in 'Home' button and 'On/Off' button together until Apple logo appears
3. Replace Sim Card
4. Hold in 'Home' button and 'On/Off' button together until normal phone screen appears.
Also, Try this:
1.) Shut down the iPhone 3G.
2.) Start up iTunes
3.) Hold down HOME button on the iPhone 3G
4.) While keeping the HOME button depressed, plug in the Sync cable
5.) A message will pop up to ask if you want to reset.
6.) Just click YES and the reset process should start.
I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309
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SOURCE: iphone 3gs works properly only
Hi,
Try the master reset function to solve this problem,here is how you go about it;
Press and hold the power and menu button simultaneously for at least 15secs,then release after the phone restarts automatically.
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