Itunes iphone se recover, unknown error (78)

Hello markku61,

Thanks for that info and for choosing the Apple Support Communities. If we understand correctly, you are unable to restore your iPhone with your computer, as you get an error message. To help with this, please see if the steps in these Apple resources resolve your situation with restoring your iPhone:

If you can't update or restore your iPhone, iPad, or iPod touch

If you see an error in Finder or iTunes on your computer

Cheers!