@hal ryanair sent to me:

We will no longer accept printed boarding passes. You must download the Ryanair App to access your digital boarding pass.

To get your digital boarding pass:

1. Open or download the Ryanair App

2. Sign in to your myRyanair account and find your booking

3. Check in as normal

4. Your digital boarding pass is available in the App

It's that simple.

but if print the qr code with the info as a screenshot of the phone and i scan the qr code at the airport?