Should I give up

I use Boinxtv since 2012 with a MBP retina for many educational projects (https://www.youtube.com/playlist?list=PLMfsc0wkmyTjiJX-XFkkDkkOmyMiYdJpL) : 2 cam firewire Sony DCR-HC62E + Canon xl1s without problem. Good job

The Sony cam is now out of order and I tried 2 hd cam (sony hdr cx740ve and panasonic fz1000) with 2 blackmagic ultrastudio mini recorder. I cant connect none of them…
I test an old cam Sony DCR hc18e pal, it does’nt work…

Should I give up this great software…

Sorry to hear that. Can you tell us in more detail what the actual problem is and what “i can’t connect none of them” actually means?
Did you follow this tutorial? http://docs.boinxtv.com/connect_cameras_using_a_blackmagic_ultra_studio_mini_recorder