Navigate and tap on Developer Options to ensure that USB Debugging is enabled. Enable USB debugging option by pressing Menu > Settings > Applications.You should have Android SDK installed on your PC.The Nexus bootloader should be unlocked.Download and install USB drivers for Nexus on your computer.Create a backup of all important data on your Nexus phone.Prerequisites to flash NMF26F Android 7.1.1 on Nexus 6P, 5X Can't miss out on the latest release since it brings both the new features and security fixes? Here's how to manually update your Nexus phones. The factory images and OTA files used in today's guide include December's security patch that fixes some critical security bugs. Follow this guide to install NMF26F Android 7.1.1 Nougat on Nexus 6P and Nexus 5X using factory images and OTA files. However, today's update is more important and exciting for Nexus users since it brings some Pixel-exclusive features to Google's Nexus phones. We have already shared with you steps to manually update your Google Pixel and Pixel XL phones. After a brief period of testing Android 7.1.1 developer preview, Google has now started to roll out the latest update to Nexus and Pixel devices.