Summary
Be careful when upgrade Android smartphone or tablet from 5.1 or higher version of Lollipop to Android 6.0 Marshmallow as updating to Android 6.0 Marshmallow from Lollipop easily causes data loss.
Is Android 6.0 Marshmallow update available on your Android devices? Will you upgrade the current Android OS to Marshmallow? Android 6.0 is said to be the fastest OS so far, comparing with 5.x Lollipop. The information as we've received shows that users with big-brand Android smartphones and tablets like Samsung, LG, HTC, Sony and Nexus are now running on 6.0 Marshmallow OS. The taste is great, as they reported, except one intolerable problem that they lose contacts, photos, messages and other multimedia files by upgrade Lollipop to Marshmallow.
To 100% protect your precious data from losing unfortunately during the upgrade, you should backup Android to PC. Many people take it as a troublesome job, which kills themselves eventually after data being wiped out. So be serious, let's ensure a safe Android 6.0 Marshmallow update by doing backups in advance. The backup process is not tiresome at all as long as you pick up the best-fit Android backup and recovery tool - Qiling MobiSaver for Android.
Step 1. Connect Android Phone to a Windows computer.
Step 2. Run Qiling MobiSaver to scan all data on Android.
Step 3. After the scan, save Android data to the computer.
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.
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.
Using an Android factory image will wipe all the data, again make sure you've done the backups with Qiling 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 Qiling MobiSaver for Android and a complete update with the guide introduced above.