Help! Unable to flash Nexus 7 back to Stock

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http://forum.xda-developers.com – Hey guys, I need urgent help here. So i flashed to Paranoid Rom 2.0 rom the other day and I reset my Nexus 7 and since then, it just got stuck at the Paranoid bootup logo and refuse to start. I tried to flash it back to Stock image but there were errors. Now it's only able to detect Fastboot mode and not ADB. Using Nexus 7 Rooting Toolkit to flash back to factory set, the process got stuck at "sending to system". What's wrong with my Nexus 7? Did i brick it? Pls help. Appreciate. Thanks (HowTos)