To update an old iPad to iOS 15, connect your iPad to a power source, make sure you have at least 50% battery, and then open the Settings app. Tap General > Software Update and then tap Download and Install. Follow the onscreen instructions to complete the update.
To unsync your iPhone and iPad, open the Settings app on both devices. On your iPhone, tap Apple ID > iCloud > Devices, then tap the Remove from Account button next to your iPad. On your iPad, tap Settings > iCloud > Your Name, then tap the Sign Out button.
To unlock an iPad without an Apple ID, you can use a third-party tool like iMyFone LockWiper or iTunes.
If you find an iPad that is not yours, you can unlock it by following these steps
1. Power off the iPad.
2. Press and hold the Home button and the Power button at the same time until you see the Apple logo.
3. Release both buttons when you see the Apple logo.
4. Enter the passcode that was previously set on the iPad.
5. If you don’t know the passcode, you can try to restore the iPad using iTunes.
To turn the ringer off on your iPad,
1. Swipe down from the top right corner of the screen.
2. Tap the icon.
3. Slide the to .
To turn on cookies on your iPad, open the Settings app and tap Safari. Then tap Privacy & Security and Block All Cookies. Finally, toggle Block All Cookies to Off.
To turn off your iPad
you can go to Settings > General > Shut Down
then drag the slider (source [Apple Support](https//support.apple.com/guide/ipad/turn-ipad-on-or-off-ipad63d30b5a/ipados)). Alternatively
on iPad models without a home button
press and hold the top button and one of the volume buttons until the power-off slider appears (source [Apple Support Communities](https//discussions.apple.com/thread/255047281)).
To turn off an iPad without the power button, press and hold the Volume down and Power buttons at the same time for about 10 seconds until the Apple logo appears.
How to change time on iPad
1. Open the Settings app.
2. Tap General.
3. Tap Date & Time.
4. Toggle Set Automatically off.
5. Enter the desired time and date.
6. Tap Set.
If the App Store won’t open on your iPad, try these steps 1. Force quit the App Store app. 2. Restart your iPad. 3. Check your internet connection. 4. Make sure you’re signed in to the App Store with the correct Apple ID. 5. Update your iPad’s software. 6. Reset your iPad’s network settings. 7. Restore your iPad to factory settings.