How to Manually Install Android 5.1 on Nexus 7, Nexus 10, Nexus 5

Google Released The Android 5.1, The First Major Update To its Material Based O.S Android 5.0 Lollipop, The Update Will Start Rolling Out in The Coming Weeks and Nexus Series Will Be The First To Receive The Update and May Be Android One Smartphones Also. And if in case You are Eager to Test out The Update, Google Has Already Posted The Factory Images, You Can Manually Install Them From Google's Website. And its Worth Mentioning That This Procedure is Only For People Who Knows The Ruisk Behind it, So Decide Whether or Not to Install The Update.

Some Pointers Before Proceeding:

• Back Up Your Data
• Get The Latest Android SDK From Here
• Android 5.1 For Nexus 5
• Android 5.1 For Nexus 7
• Android 5.1 For Nexus 10
• Charge Your Phone To At Least 80%

Once You Have The Android SDK File, Add The SDK Path By Following Below Steps

• Right Click on My Computer> Properties
• Click Advanced System Settings
• Click System Properties > Advanced > Environment Variables
• Select Path And Click Edit and Now Type The Name of Directory or Location Where You Have Installed The SDK
• Enable USB Debugging Option
• Extract The Downloaded Image Files (Links Above) To Computer/Laptop
• Connect Your Device via USB
• Switch off The Device and Start Fastboot (Find The Combination Keys to Enter into FastBoot From Here)

Note: If Needed Unlock Your Bootloader By Entering: fastboot: oem: unlock

• Open Command Prompt and Navigate to Extract Image Files Location
• Now Execute flash-all.bat, This Will Install All The Necessary Bootloader, Firware, etc.
• Make Sure That ABD and Fastboot are Installed Correctly
• Once You are Done With Process Just Re-Lock The Bootloader By Entering The Command: fastboot: oem: lock when Connected via USB and Fast Boot

Though The Process Might Look Simple, We Suggest You Wait For The OTA Update and Its Suggested To Follow The Guide Step By Step Correctly if You Have Decided To Flash The Update via Fast Boot.