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How to Upgrade HTC One XL (Envita) to CM 12.1, Android 5.1.1

Either that your HTC One XL is S-On or S-Off, the bootloader is locked or unlocked, you can upgrade the phone to Android 5.1.1 by flashing CM 12.1 on it.

In this tutorial, I explain the step by step guide on how to upgrade your HTC One XL to Android 5.1.1 by flashing CM 12.1 on it.

FIRST, THE REQUIREMENTS:
1- CUSTOM RECOVERY:
To flash custom recovery on your HTC One XL, you have two (2) options and they are;
i- Unlock the bootloader following the instructions here; "Unlocking HTC Bootloader" and then, flash custom recovery on it following the instructions here; "Flash Custom Recovery On HTC Using Command Prompt".

ii- Root the phone following the instructions here: "How to Root HTC One XL" and then, flash custom recovery on it following the instructions here: "Flash Custom Recovery On Any Rooted Android".

NOTE:
For S-On HTC One XL, it is a must that you unlock the bootloader. This is because boot.img file must be flashed on all S-On HTC android devices for any custom ROM to run on them.

2- CM 12.1 ROM: now, you need to download CM 12.1 (Android 5.1.1) either on the phone or onto your PC from the link here.

3- GAPPs: GAPPs are packages designed for every android versions. GAPPs are mostly required for every custom ROM to function properly. You may download compatible GAPPs for the CM 12.1 here.

UPGRADING HTC ONE XL to CM 12.1, ANDROID 5.1.1

Step 1: First, if you have downloaded the custom ROM and GAPPs from the link above, you should move them to the root of the SD Card.

Step 2: Boot to Recovery: remember that you need either of the compatible custom recovery flashed on the HTC One XL to carry out this operation.
Now, you should boot to recovery. You may use CM Recovery, ClockWorkMOD Recovery or TWRP Recovery.

Step 3: INSTALL THE CM 12.1 ROM:
NOTICE:
FOR CLEAN or FRESH INSTALLATION

i- Wipe Data/Factory Reset the Phone. On TWRP Recovery, simply select "Wipe".
ii- Select the "Install from SD Card" or "Install" for TWRP Recovery users.
iii- Navigate to the CM 12.1 ROM you downloaded and select it. Wait few seconds for the installation to complete.
iv- Following the same routine, flash the GAPPS on the phone as well.

FOR UPGRADE INSTALLATION
This is for those that already have earlier version of CM ROM installed on the HTC One XL and wished to upgrade to the CM 12.1, android 5.1.1.

i- Once you are in the recovery, choose "Install from SD Card" or "Install" for TWRP Recovery users.
ii- Navigate to the cm 12.1 ROM you downloaded and select it. Wait few seconds for the installation to complete.
iii- Following the same routine, flash the GAPPs on the phone as well.
iv- Wipe cache/delvic cache and then, reboot the phone.

Meanwhile, in either case, I suggests that you back up your files in case you have corrupt partitions during the upgrade.
Here is detailed tutorial on how to backup your SMS, Text Messages and backing up your Whatsapp messages is here. You may also want to backup your applications, here is how to back up your applications.

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