Hello! I'll be arriving in FRA from BEG at the AEUW gates on LH (Y), connecting to Condor (J) to the US (gates B48-60) on separate tickets, no check-in bags. It's a 4.5hr layover, so I'm hoping that it isn't too risky.
1. Do I need to go through transit security?
2. Do I need to go through passport control?
3. How much time will each of these take (US passport)?
4. Will there be a Condor transfer desk somewhere on the way in case OLCI and mobile boarding pass don't work? Or would I need to exit landside and go to the terminal checkin area?

Thank you!