iPhone 12 mini touch screen won't respond after iOS update

indigo821 wrote:

After my 14.7.1 update overnight, my touchscreen is unresponsive. I had kept up with all updates and never had touchscreen problems until after this update. Have only had phone 6 weeks. Cannot swipe up to go through follow up update (so stuck on seeing hello in all languages); cannot turn off alarm. Cannot swipe right to turn off phone for restart or enter passcode (passcode screen is gray). My computer does not recognize phone when plugged in, so I cannot even restore to factory settings. Took off screen protector and case, plugs and ports work fine, etc. I really think a software issue but am stuck on how to restart, redo update or restore if not recognized by computer and with touchscreen not working.

try this first If your iPhone won't turn on or is frozen - Apple Support

If that doesn't work do this If you can't update or restore your iPhone, iPad, or iPod touch - Apple Support