Default [Q] Intenso TAB 714 bricked

Hey guys, I hope you can help me.
I tried to install a new recovery for my Intenso tablet but unfortunately I used a wrong recovery image (recovery image for Intenso TAB 814 instead for TAB 714).
After I installed the new recovery, my tablet worked still, but after I tried to get into recovery menu, it didn't boot anymore.

Has anyone an idea how I could fix that?