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Even though Google has already released Android Marshmallow and Nougat, a lot of people prefer to stay with the older Android 5.1.1 Lollipop. Some appreciate the simplicity that this version offers, while others just don’t want to bother mastering the new features and interface of the new firmware.

Fortunately, if you feel the same way, there are several easy ways to install Android 5.1.1 Lollipop to your device. We’ve listed some of them below:

If you’ve already upgraded to newer firmware

Let’s say you’ve downloaded Android Marshmallow but found that you don’t like it and that you want to go back to Lollipop. Unfortunately, there’s no official way to do this, so you’ll need to go the long way around to bring back Android 5.1.1. to your device.

Before doing anything else, though, you have to back up all of your data. Reverting to an older OS version can make you lose your messages, contacts, photos, videos, and other data, so it’s important create a copy of them beforehand. There are lots of tools that allow you to do this, such as Helium, CM Backup, Titanium Backup, and Backup Your Mobile. You also have to bootloader-unlock your device if you haven’t done so yet, since your system needs to be unlocked before it can accept a non-official firmware update.

Once you’ve backed up your data and unlocked your device, the next thing you should do is to download and install ADB and Fastboot to your desktop/laptop. These programs basically allow your computer to communicate with your Android mobile device so you can send commands from your desktop or laptop to your smartphone or tablet.

Next, you’ll need to download the factory image for Android 5.1.1 Lollipop for your specific device. Factory images contain all the files you need to install Android 5.1.1 in your smartphone or tablet, and they’re different for each device make and model. Because of this, you need to find and download the appropriate image for your device. Don’t worry since a quick search on Google will lead you to the correct image; once you find it, you’ll need to download it on your laptop or desktop PC.

From here on, you’ll need to follow a specific set of instructions depending on the make and model you own. If you have a Samsung tablet or smartphone, for instance, you have to enable Developer Mode and USB debugging and download and install Samsung USB drivers and Samsung Kies (on top of ADB and Fastboot). The process is more straightforward if you own a Nexus device.

If you’re still on Android 5.0 Lollipop or older versions

Android devices are programmed to upgrade your device to the newest possible OS version that it’s eligible for. So, if your smartphone or tablet is eligible to get Android 6.0.1 Marshmallow, this is exactly what you’ll get if you try to update your OS through OTA. This isn’t a problem if you do want Marshmallow, but it can be an issue if you prefer to have Android 5.1.1.

Fortunately, OTA isn’t the only way to get Lollipop. You can follow the steps listed above to get Android 5.1.1 to your device, or you can check this guide to know how to get CyanogenMod’s version of Lollipop.