iPhone 11 is trying to install 14.7.1, download was successfull, the device seems to be frozen

It should reboot itself after a while of showing the "Installing" popup. If it does not, you may need to manually restart it.

Quickly Press the volume up button and release, press the volume down button and release, then hold the sleep button down until the iPhone restarts and an Apple logo shows up on screen. Ignore the Power Off slider if it appears.

Let it restart, and it should resume installing the update.

What does it say in the Settings->General->Software Update screen currently?

Is the iPhone connected to Wi-fi and has at least 50% battery charge or is also connected to power?

rolf101 wrote:

Thanks, After restart it had 14.7.1 installed

You're welcome. Glad it worked out.