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If you own a Samsung Galaxy S4, you probably already know that it’s unlikely to receive the Android 6.0 update. This isn’t really surprising; it’s been three years since the flagship phone was released, which means that its hardware and software are no longer advanced enough to support Marshmallow’s modern features. And, even if the S4 was eligible to get the update, it’s probably already too late to make an S4-compatible Marshmallow update since Google is set to release Android Nougat just a couple of months from now.

With these in mind, you’re probably considering using custom ROMs to update your Samsung Galaxy S4 and get your hands on Android Marshmallow. This isn’t exactly new since many Android owners do this all the time. But don’t just download the first custom ROM you come across with; before doing anything else, you need to take the following steps:

  1. Back up your data

You’ll need to do a complete wipe on your device before you can install the Android Marshmallow custom ROM. Because of this, you have to make sure that all your important data is backed up and that you can easily access it after your installation.

  1. Root and unlock your phone.

You’ll need to do these before you can install the custom ROM. You’ll also have to install recovery tools, such as CWM and TWRP.

  1. Charge your battery

Just like with normal OS updates, installing a custom ROM can brick your phone when interrupted. To prevent this from happening, charge your device beforehand to ensure it won’t shut down in the middle of installation due to an empty battery.

  1. Look for the right custom ROM

Not all custom ROMs are created equal; many of them are created with just one kind of model in mind. Some, for instance, work only on Samsung Galaxy S4 i9505, so check the specific model of your handset first before making the download.

Doing these things won’t guarantee a 100 percent successful installation, but it will at least prevent your device from bricking. So, take these steps now and let them help you successfully upgrade your Samsung Galaxy S4 to Android Marshmallow.