Restore Your Nexus Tablet to Factory Settings
To wipe all the data from your Nexus tablet, follow these steps. First, go to Settings and tap Backup & Reset.
Touch Factory Data Reset and Reset Tablet. You’ll be prompted to enter your PIN or pattern if you’ve set one up.
Next, tap Erase Everything. If your Nexus 7 or 10 is connected to a carrier data plan, be sure to call and
disassociate the device from your account. Your Nexus tablet is now ready to be sold.