i also checked my usage but there was no "ios 9.1 beta" there that i can delete. please help, thanks!
Sure:
- Make sure that you're using the latest version of iTunes.
- Turn off your iPhone and leave it off.
- Plug in your iPhone's USB cable to a computer with iTunes.
- Hold down the Home button on your iPhone as you connect the USB cable. Keep holding down the Home button until you see the Connect to iTunes screen.
- When you see this screen, release the Home button. If you don't try steps 2 through 4 again.
- When your iPhone is connected, iTunes will open. You'll see a message saying that iTunes has detected an iPhone in recovery mode.
- Accept iTunes's prompts to restore. Restoring in recovery mode will erase your iPhone, but it will now be back on iOS 9.0
- You then wait to be propmted to update to 9.0.1
Max.