Mb.
The journalists managed to get the firmware file, nothing is known. But it is reported that the image was found on Google's servers. In Android Police point out that the Assembly is not available the final (but very close to it), and there are some errors in the image. However, the owners of the Nexus 7 (2012) can still install this update on their devices.
If we talk about problematic aspects in more detail, when you try to install the bootloader, users will receive the error message, the digital signature. However, installing the bootloader is optional. You can skip this step and proceed to the firmware files system.img and boot.img.
Remember that all manipulations with your device you are at your own risk, and edited by Droider.ru are not responsible for the availability of your gadget after flashing.
Links to download:
-1 Source ()
Source 2 ()