Note:Backup Android Before Getting Marshmallow Update
Two Effective Ways to Upgrade Android from 5.1 Lollipop to 6.0 Marshmallow
With backups in hand, you can now start to upgrade Android Lollipop to 6.0 Marshmallow without worrying about data loss. Here we introduce you two effective ways to upgrade your Android to the latest OS.
Option 1. Android Marshmallow upgrading from Lollipop via OTA
The "over the air" (OTA) update is the most highly suggested way for updating Android OS, as it is incredibly simple and fast, everyone can handle it well.
Step 1. Open "Settings" on your Android phone;
Step 2. Find "About phone" option under "Settings", tap "Software update" to check for the latest version of Android. This step is critical, and you must update your phone to the latest version of Android Lollipop before updating to Marshmallow, which means you need to be running Android 5.1 or higher to update to Android 6.0 Marshmallow seamlessly;
Step 3. Once downloaded, your phone will reset and install and launch into Android 6.0 Marshmallow.
Option 2. Force Android Marshmallow update via factory image
Using an Android factory image will wipe all the data, again make sure you've done the backups with EaseUS MobiSaver. Note that this process is only for advanced users, and better on Nexus devices.
Step 1. Download and install the latest Android SDK on your Windows computer;
Step 2. Add the SDK folder to the path: My computer > Properties > Advanced system settings > System properties > Advanced > Environment variables;
Step 3. Enable USB debugging;
Step 4. Download the factory image for your device on your Windows computer and connect your Android to the computer via USB;
Step 5. Boot your phone into fastboot by holding down the volume up, volume down, and power button when turning your device on;
Step 6. Open up a command terminal on your computer and execute “flash-all.bat” to install the necessary files and OS onto your phone;
Step 7. Once done, Google recommends you lock your phone’s bootloader for security. This is done by rebooting your phone back into fastboot mode while connected via USB and then execute "fastboot oem lock" from a command terminal on your computer.
These are two ways to upgrade Android from Lollipop to 6.0 Marshmallow available at the moment. Hope you do a secure update with the help of EaseUS MobiSaver for Android and a complete update with the guide introduced above.