Encrypt Android and restore a bricked Google nexus 7
With the later (exact version unknown) it is possible to encrypt the whole Android device. This should mean that anyone getting hands on your machine can’t get to its data. I don’t know the encryption method nor do I know if there are any holes to exploit that makes the encryption moot.
Just go look in the Settings and there is a Security and from there you’ll find your way.
The memory card can be encrypted too.
For encrypting a device one must start using a pass code to start the machine.
For security one should also have a pass code to open it. Now this can be tedious, pressing in 4 characters or more every time you want to do a small check.
Try out Llama. It can react on the cell masts/IDs and in a beta to WLANs. For instance have the device not being locked while being at home (close to a mast or within your home’s WLAN range).
Restore a Google nexus 7
First hits when googling google nexus restore are various kinds of holding down power button and up/down volume.
If this does’t work there is a hidden while doing System restore I found here.
If you are so out of luck this doesn’t work go here to do a full OS replacement.