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The power button is on top of the iPhone 4. You hold down the button to either turn the phone on or off.
First turn off your iPhone. To reset your iPhone without a password, you will have to hold down the home button and then connect your phone to your computer. Your phone will then turn itself on and go into recovery mode. This will delete all data on your phone and reset it to the factory default settings. A second option is to go to iForgot on the Apple website and reset your password from there.
Yes
One way to downgrade an iPhone 4 is to go into settings on the phone and reset it to factory settings.
What you do is you go and plug up ur iPhone to the iTunes and click on the update button
The four digit number to unlock the iPhone is your choice but if it's not working then call the company you brought the iPhone from.
Soft reset your iPhone (turn off and turn back on) If that doesnt work try hard reseting you iPhone (hold down sleep/wake button and home button until the apple logo apears- don't worry it doesn't affect your apps/music) If that doesn't work restart your computer. If that doesn't work then download the latest version of itunes.
The easiest way someone can find an instruction to install a home button is using Youtube. There are other websites like Ifixit which explain installing a home button on the iPhone 4.
Try the factory standard code of 0000 (four zeroes). If that doesn't work - you'll have to get it reset by a phone shop.
To fix an iPhone 4 with no sound, simply reset the phone, reboot, or jail break it if all fails, because the problem is software-based.
You should go to Apple store. They will repair it, if they couldn't repair, they will replace your phone with new iphone 4.
On the side above the volume up button there is a switch flip it