I cant Force a restart on iPhone 12

martinap92 wrote:

Exact same advise,,, still not working?

If your iPhone, iPad, or iPod touch won't turn on or is frozen

https://support.apple.com/en-us/HT201412

If your screen is black or frozen

If your screen is black or frozen, you might need to force restart your device. A force restart won't erase the content on your device. You can force restart your device even if the screen is black or the buttons aren't responding. Follow these steps:

iPhone 8 or later: Press and quickly release the Volume Up button. Press and quickly release the Volume Down button. Then press and hold the Side button until you see the Apple logo.

If you are unable to force restart and cannot connect via iTunes, then you need to use the Get Support link at the top of the page here to contact Apple Support. This sounds like it could be a hardware issue.

If Force Restart isn’t working, it is because you are not doing it right.

Check the instructions for your iPhone in the iPhone User Guide https://support.apple.com/guide/iphone/force-restart-iphone-iph8903c3ee6/ios.

Try this, Force restart iPhone - Apple Support