Tips & Tutorials

Update HTC One M9 to CM12.1 Android 5.1.1 Lollipop Unofficial Custom ROM

The very first build of CM12.1 is now available with Android 5.1.1 Lollipop for the HTC One M9. CyanogenMod 12.1 brings a complete stock Android experience to the HTC One M9, the latest flagship device by HTC. Since this is an early build, there are a few broken features, but we expect all that to be fixed as new updates are released over time. And with that, you will be able to update HTC One M9 to Android 5.1.1 CM12.1 Unofficial Lollipop using this complete tutorial. A custom recovery will be needed to install Android 5.1.1 based CM12.1 Unofficial ROM zip and Google Apps zip files, since this is not an official HTC firmware update. Make sure your HTC One bootloader is unlocked or you won’t be able to install custom ROMs. If interested in Android 5.1.1 for other phones, check out our new Custom ROMs section.

If this is your very first time installing a custom ROM, we understand you would want to make sure your installation process go as smooth as possible. So before we actually jump to the installation process of CM12.1 Unofficial ROM, let’s take a look below at how to backup all your data. When installing this Android 5.1.1 Lollipop based custom ROM, your entire data will be wiped clean — like a brand new phone. As a HTC One M9 user, you have several options to choose from depending on how you want to store your data. These are the some of the tips given below that we want you to keep in mind and then proceed.

Android 5.1.1 Lollipop CM12.1 Unofficial ROM - HTC One M9

Disclaimer: All the custom ROMs and firmwares, official software updates, tools, mods or anything mentioned in the tutorial belong to their respective owners/developers. We ( or the developers are not to be held responsible if you damage or brick your device. We don’t have you on gun point to try out this tutorial 😉

Android 5.1.1 CM12.1 Unofficial Lollipop ROM Details:

This amazing CM12.1 Unofficial custom ROM comes with tons of new features and is based on Android 5.1.1 Lollipop. The features that are ‘broken’ and not working are:

  • Camera
  • FM Radio (Not supported)


There are tons of useful articles and how-to guides on Team Android for the HTC One M9, but we think you might be interested in the following posts:

Like this CM12.1 Unofficial ROM based on the latest Android 5.1.1? We love it too and we know you are looking forward to install it on your phone now. Now please read below for important tips on how to make sure your installation goes smooth and you do not end up with any problems.

HTC One M9 USB Drivers

You will need to connect your Android phone with the computer. For that, please make sure you have installed the USB drivers for HTC One M9 properly. If not, you can download the latest official drivers from our Android USB Drivers section here:

Download HTC One M9 USB drivers!

Backup and Other Important Tips

Done with the USB drivers? Perfect. The tutorial is on the next page, but first, please take a look at the following tips and important points you need to take care of. These are important, as we don’t want anyone losing their personal data or apps:

Always backup your important data that you might need after you install a new custom ROM, an official software update or anything else. Make a backup for just in case, you never know when anything might go wrong. See below for some tips on how to backup data:

HTC users can also back up data using HTC Sync. If you backup data manually, you get more options what to choose from and it is very easy to move data across Android devices from different manufacturers, i.e moving HTC One M9 backup data to Samsung Galaxy S6.

If you already have a custom recovery (ClockworkMod, TWRP etc.) installed on your phone, we strongly recommend a backup using that as it creates a complete image of your existing phone set up. It is easier and faster to restore your phone through a custom recovery.

A few more optional tips that you should remember:

1. Having problems connecting your Android phone to the computer? You need to enable USB debugging mode. See here: How to Enable USB Debugging — for Gingerbread, Ice Cream Sandwich, Jelly Bean, KitKat and Lollipop.

2. Make sure your Android device is charged up to 80-85% battery level. This might help you: How to Check Battery Percentage. Why? Because, if your phone goes off suddenly while installing a custom ROM, flashing an official firmware update or installing mods etc. — your phone might get bricked or go dead permanently. No one wants that, right?

4. Most of the tutorials and how-to guides on Team Android are for factory unlocked Android phones and tablets. We recommend NOT to try our guides if your phone is locked to a carrier, unless we have specified the carrier name or device model.

If you find the above tips useful and they were helpful to you, please consider giving us a +1 or SHARE with others so they can also benefit from these tips!

All set and ready? Good. Now, let’s proceed with the tutorial on the next page and update HTC One M9 to Android 5.1.1 CM12.1 Unofficial Lollipop custom firmware.

About the author

Haris Nadeem

He lives on everything Android; has countless devices, apps and games to play with everyday. Currently serving as the Chief Editor at Team Android.

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