VERY IMPORTANT: I am now adding the JZO54K binaries compiled for Android 4.1.2 - I HAVE NO IDEA WHAT THESE WILL DO IF YOU FLASH THEM ON 4.1 OR 4.1.1 and I am absolutely NOT responsible for any damage you may do with them. I provide them only as a tool, or for those who may have flashed the JRO03R binaries over JZO54K - YOU HAVE BEEN WARNED
This zip contains the JRO03R/JZO54K binary drivers (depending on which you download).
* WiFi, Bluetooth, and GPS by Broadcom
* Touchscreen by ELAN
* Orientation sensor by InvenSense
* Graphics & CPU by nVidia
* DRM by Widevine
BEYOND THIS POINT, THERE BE DRAGONS - I am not responsible if you FUBAR your device, but if you follow my instructions, you won't. I've tested this zip on my n7 and my brother's, as well. No issues on either device.
Just put the zip in /sdcard, reboot into recovery and flash it. No need, AFAIK, to clear cache or dalvik, as these are the actual system binaries.
I've noticed faster GPS lock times, marginally better WiFi signal, marginally faster Bluetooth transfers, and considerably better touchscreen response. I haven't done anything to test graphics or DRM yet, but when I do, I'll get back to you.
DropBox JRO03R Download: Nexus7-Binary-Update-JRO03R.zip
DropBox JZO54K Download: Nexus7-Binary-Update-JZO54K.zip