[Q] Kind of Bricked My Device (Nexus 7 3G) topic

So what happened was that I tried to install the update of paranoid android's latest version. Since TWRP cannot install it, I used CWM. All my back-ups are in TWRP so I had no chance to restore. Now, my device is stuck in recovery mode. I could enter the fast boot mode. Now I don't know what to do since all guides in restoration say that I have to enable USB debugging, something impossible in a device which cannot enter the interface.

Please help. Thanks