Do the checkin online and add the boarding pass to your ios/android wallet, as simple as that. Just did the last weekend with ryanair. Btw the faq specify that

Do the checkin online and add the boarding pass to your ios/android wallet, as simple as that. Just did the last weekend with ryanair. Btw the faq specify that as long as you do the checkin online, if you lose your device or it dies a boarding pass will be printed for you for free