Update AT&T HTC One (2014) To Android 5.1.1 Lollipop With Stable CM12.1 Snapshot ROM

An stable version of CM12.1 is out for AT&T HTC One (2014) now. This is a good time to upgrade your device to latest Android 5.1.1 Lollipop with the help of CM12.1 (snapshot) build. By flashing snapshot build you not only remove the bug prone of nightly build but also use more stable version of CyanogenMod ROM. If you are looking for a stable ROM for your AT&T HTC One (2014) then you can try official CM12.1 (snapshot) custom firmware for AT&T HTC One (2014) is now available. If you still using any nightly build of a custom ROM then we recommend you to try snapshot to enjoy better using experience. Since CM12.1 is based on Android 5.1.1 Lollipop, you will enjoy all feature of Lollipop as well as various customization of CyanogenMod. Below you will found a step-by-step guide on how to upgrade AT&T HTC One (2014) to Android 5.1.1 Lollipop using CM12.1 (snapshot) custom ROM.

[CyanogenMod project is discontinued. No download link that come with CyanogenMod.ORG domain is available. Read More about it in Wikipedia. Instead search for LineageOS ROM which is successor of this highly popular CyanogenMod. In trueandroid.com you may find some tutorial about LineageOS. Use search box to search if LineageOS ROM for your device is covered by us or not.]

Some of the cool Android 5.1.1 Lollipop features that you will enjoy are improved Quick Settings panel, HD voice calling, native dual-SIM support, Revamped Screen Pinning, improved Device protection that stopping thieves from factory resetting your phone, improved Volume and Interruptions sliders and many more.

Related Readings:

CyanogenMod-12.1

Warning!

This tutorial is only for AT&T HTC One (2014). Don’t try this guide on any other Android device. Also, we (True Android Team) are not responsible for any damage caused due to the instruction given in this page. Try this at your own risk. However, it is very unlikely that your device will be damaged if you follow all the instructions as it is which are mentioned in procedure.

Pre Requisites:

1. Backup your device data. You can follow our ultimate backup guide.

2. Make sure your device have at least 60% battery power. You can install an app like Battery Percentage on your Android device to check it easily.

3. You already have USB Driver Installed for AT&T HTC One (2014) in your PC. [Download USB Drivers]

4. Make sure USB Debugging is enabled otherwise you won’t able to transfer file between PC and AT&T HTC One (2014). [Guide].

5. Your device have latest CWM recovery or TWRP recovery installed. [General Guide]

If you done everything that we mentioned above then you are ready to follow step-by-step guide on how to install Android 5.1.1 Lollipop based CM12.1 (snapshot) ROM on AT&T HTC One (2014).

Please Note: If your device already running on CM11 or CM12 or CM12.1 ROM then you don’t need to perform wipe.

File Required(Download by clicking on it)

  1. CM12.1 (snapshot) ROM For AT&T HTC One (2014) [Filename: cm-12.1-20150901-SNAPSHOT-YOG4PAO23A-m8.zip ]
  2. Google Apps [Filename: gapps-510-base-20150327-1-signed.zip] or any other Android 5.0 Lollipop GApps

How to Install Android 5.1.1 Lollipop based CM12.1 (snapshot) ROM on AT&T HTC One (2014)

  1. Connect your device to PC using USB cable and then copy downloaded files to the SD card of your device. Important: Don’t extract any files.
  2. Disconnect USB and then turn off your AT&T HTC One (2014).
  3. Now, boot into recovery mode. To do so, press and hold Volume Down and Power button together to boot into HBOOT menu, from there select Recovery [use volume buttons to scroll and Power button to select]. Alternatively try this: Recovery Mode without Key Combination.
  4. Perform a Nandroid backup of your existing ROM that you can restore later if this new ROM not work or you want to go back into your previous ROM. To perform a backup, select Backup and Restore, then on the next screen, select Backup again. Go back to main recovery menu after backup is complete.
  5. Now, perform data wiping task. To do so, select wipe data/factory reset, then select Yes on next screen to confirm your action. Wait few minutes till the data wipe is complete. Now come back to CWM recovery main menu. Select wipe cache partition and after wiping process done, select Wipe Dalvik Cache under advance option to perform Dalvik cache wiping.
  6. Select install zip from sdcard, then select choose zip from sdcard (or /sdcard1 for external storage). Now, locate the CM12.1 (snapshot) Zip file that you copied earlier in Step 1 and select it by pressing Power button. Confirm installation by selecting Yes – Install _____.zip on the next screen. The ROM installation will begin.
  7. Once the ROM installation process end, repeat the step 6 but choose the gapps-510-base-20150327-1-signed.zip file instead of ROM zip to install the Google apps package.
  8. When installation is completed, go back to the main recovery menu and select reboot system now to reboot your AT&T HTC One (2014) and boot up into Android 5.1.1 Lollipop ROM CM12.1 (snapshot).
  9. Returning to Previous ROM: To go back to your previous ROM, boot into recovery, select backup and restore then restore your previous ROM by selecting it from the list.

Tutorial For TWRP Recovery Users:

  1. Connect your device to PC using USB cable and then copy downloaded files to the SD card of your device. Important: Don’t extract any files.
  2. Disconnect USB and then turn off your AT&T HTC One (2014).
  3. Now, boot into recovery mode. To do so, press and hold Volume Down and Power button together to boot into HBOOT menu, from there select Recovery [use volume buttons to scroll and Power button to select]. Alternatively try this: Recovery Mode without Key Combination.
  4. Create a Backup using TWRP Backup Option.
  5. Perform a Factory Reset (this will delete all apps and their settings and game progress). To do this, Tap on Wipe, then at the bottom of the screen do a Swipe on the ‘Swipe to factory reset‘ option.
  6. Now its time to add zip file for flashing. Tap on Install, then browse to the location where you saved the files and tap on the CM12.1 (snapshot) Zip file. Then tap on Add More Zips, and add gapps-510-base-20150327-1-signed.zip. Now at the bottom of the screen, do a swipe on the Swipe to confirm flash option to begin flashing.
  7. When installation is completed, go back to the main recovery menu and tap on Reboot and then, tap on System to reboot your AT&T HTC One (2014) and boot up into Android 5.1.1 Lollipop ROM CM12.1 (snapshot).
  8. Returning to Previous ROM: To go back to your previous ROM, boot into recovery, select Backup then through Restore option, restore your previous ROM by selecting it from the list.

Congrats! Android 5.1.1 Lollipop firmware based custom ROM CM12.1 (snapshot) is now installed and running on your AT&T HTC One (2014).

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