Tips & Tutorials

Update HTC One X to Android 5.1.1 FlexOS Lollipop Custom Firmware

This brand new custom firmware brings Android 5.1.1 Lollipop to HTC One X. HTC won’t be releasing an official Android 5.1.1 Lollipop firmware for this device but thanks to the developers community, you can enjoy the latest iteration of Android on this old device. This custom firmware provides a number of features like “Flex Control” which lets you tweak and customise your device from one place and one menu. It also provides a LCD Density Changer feature to play with. This ROM is still in its beta stage but performs very well. If interested in Android 5.1.1 for other phones, check out our new Custom ROMs section. You can update One X to FlexOS Android 5.1.1 Lollipop custom firmware using the tutorial below. This is not an official release by HTC, but just a custom ROM that is based on the latest AOSP release and would require a custom recovery like ClockworkMod in order to flash the ROM zip and Google Apps zip files on your phone. Make sure your HTC One X bootloader is unlocked or you won’t be able to install custom ROMs.

As you continue reading, we will tell you how to install FlexOS Android 5.1.1 Lollipop custom ROM on HTC One X. All the step-by-step instructions are given below, and we have also given a few extra tips that you have to keep in mind before proceeding. Make sure you backup all your existing data in the phone before proceeding as this tutorial will wipe out all your internal storage data. The following tips are important as they will help the installation procedure to go smooth without any issues. Let’s get to the tutorial now.



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 😉

FlexOS Android 5.1.1 Lollipop ROM Details:

This amazing FlexOS custom ROM comes with tons of new features and is based on Android 5.1.1 Lollipop. A quick list of the main features in FlexOS is given below and we are sure you’d love to use this on your One X:

  • FlexControl – All the tweaks and features in one place!
    Animation Control – Toast animations, Listview animations and system transitions.
    HeadsUp Customizations just like Cm11!
    Slim DSLV
    Navigation Bar Tweaks – On/Off Toggle, Dimensions
    Navigation Bar Tint
    Slim Advanced IME Features
    Statusbar Network Speed Meter
    Screen Sound Enable/Disable Toggle
    Camera Switch Sound Enable/Disable Toggle
    OmniSwitch – Use omniswitch alongside stock android recent apps or use it as primary.
    Recents FAB Button – Positions (Top left, Top right, Top center, Bottom left, Bottom right, Bottom center)
    LCD Density Adjuster
    Volume Steps
    Hide superuser icon in statusbar
    Double tap to sleep on navigation bar and status bar
    Instant reboot from power menu
    App Circle Sidebar
    Captive Portal – If disabled, a connection to google servers is not required in order to detect data connection.
    CyanogenMod Theme Engine
    Statusbar Clock Customization
    Volume Steps
    Inbuilt File Manager from OmniROM
    Quick pulldown
    Moar Material!
    Battery icon customization
    Statusbar Carier.
    Statusbar clock color.
    Statusbar clock font style.
    SlimPIE: Configurable sensitivity.
    SlimPIE: give user ability to reduce trigger heights if IME keyboard shows up.
    Ambient Display.
    Statusbar: toggle for network activity arrows.
    Merged Battery Bar.
    Inbuilt Lantern Music Player.
    Sync, Screenshot, HeadsUp, NavigBar On/Off tiles on top of CM
    Gesture Anywhere

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

Like this FlexOS 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 X 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 X properly. If not, you can download the latest official drivers from our Android USB Drivers section here:

Download HTC One X 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:

Samsung users can also back up data using Samsung KIES. 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 Samsung Galaxy Note backup data to HTC One X.

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.

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 and Jelly Bean.

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 LIKE to thank us!

All set and ready? Good. Now, let’s proceed with the tutorial on the next page and update One X to FlexOS Android 5.1.1 Lollipop custom firmware.