Download Android 5.1 Factory Images For Nexus 5, 7 Wi-Fi and 10
Google has announced Android 5.1 version. Google claims that this update is optimized to improve stability and performance. Further, it brings new features like support for multiple SIM cards, better security and HD voice (for compatible phones).
The new security features are related to device protection. When your phone is lost or stolen, it will remain locked until you use your Google account to get it unlocked. It will remain locked even when someone performs factory setting over device. This feature is rolling out for most Android phones and tablets shipping with Android 5.1 in addition to Nexus 6 and Nexus 9. This update is available for following devices as factory images, for now:
Nexus 5 (GSM/LTE)
Nexus 7 (Wi-Fi)
Visit the official Android’s page for downloads and instructions related to installation.