How to downgrade Nexus 7 2012 (wifi/grouper/nakasi)?

Hitanshu Gandhi  
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a. Install USB drivers and platform tools from android: /
Run it, then only select platform tools and Extra/USB drivers (uncheck others) for download/installation. Note the location.
Update ADB drivers via this hack (critical):

b. Unlock the OEM bootloader via SkipSoft toolkit. Awesome piece of work, that. Make sure its in ADB mode.

c. Download the ROM version you want from Unzip it (individual files within TAR) using 7-Zip into the platform-tools folder under the Android tools.

d. Navigate to platform-tools folder under SDK folder. Just run “flash-all.bat” script and you’ll be done in 2.5 minutes. Voila, no lag!