Update AT&T HTC One to Android 4.3 JB with CM10.2 Custom ROM

Even though the official custom Android 4.3 update hasn’t been rolled out by CyanogenMod for the One smartphone yet, those who own the mentioned handset can enjoy the latest version of Jelly Bean and all thanks to the third party devs who has released the CM10.2 custom ROM firmware. The software is based on Android 4.3 Jelly Bean system, so a custom version of the OS will be installed on your AT&T HTC One. This tutorial will take you through the flashing operation of the same, so stay close and read the guidelines from below for updating your device with CM10.2 platform.

CM10.2 is a free aftermarket distribution of the Android 4.3 Jelly Bean firmware, so the update for your HTC One is a custom one, not an official software released by HTC or Google. So, the same can be only manually installed on your phone. The best is that when talking about custom ROMs, especially CM10.2 which is one of the most popular platforms available for the Android OS, we are talking about stock and extra features, capabilities and apps that can be used for upgrading the battery life, bumping the speeds and improving the performances of your smartphone.

Anyway, after installing the JB 4.3 powered CM10.2 update on your AT&T HTC One, don’t expect to receive the stock Android 4.3 looks as the firmware will come with its own appearances, effects and themes. Remember that this is a custom ROM that is different from the default Android system.

Anyhow, since you will have to manually install the update on your phone, there are some things to take care first. I am talking about the general and specific pre requisites, which are being listed below.

  • First of all, read everything you need to know about installing custom ROMs on Android devices, by using our dedicated step by step guide.
  • Then, learn how to root your HTC One smartphone because the CM10.2 firmware can be flashed only on rooted systems.
  • This is an unofficial update, so the installation process is also unofficial. These aspects are implying the following: the warranty of your handset will get void.
  • For restoring the warranty restore the stock Android OS -> downgrade the HTC One to stock Android OS, or update with an official release of the Jelly Bean firmware.
  • Then, the software can be applied only through a custom recovery image. I recommend you to use CWM or TWRP recovery as these are the most used custom recovery tools for Android. Be aware: the custom recovery app can be installed only on rooted devices.
  • Backup the HTC One data and also make a Nandroid backup on your way. Save everything you can and need because the system will be wiped out and you will lose all of your personal info, accounts, saves and data (I’m talking about text messages, call logs, internet settings, market apps, calendar info and so on).
  • A computer must be used while you will have to connect your handset with the same – the phone’s USB cable must be somewhere near you.
  • The download will be made manually (CM10.2 firmware must be downloaded on your computer) so deactivate the security protection from your computer.
  • Also, the update process will take a couple of minutes therefore charge your HTC One if there is less than 60% power left.
  • Go to “Settings -> Applications -> Development -> USB debugging” and check the last option.
  • Remember to install CM10.2 Android 4.3 JB by using the steps from below only if you have the AT&T version of the HTC One. Using this tutorial for a similar or different Android based smartphone will probably brick your device.

How to Update AT&T HTC One to Android 4.3 JB with CM10.2 Custom ROM Firmware

  1. Download the firmware by using the link from here.
  2. You should save the file on desktop without unzipping.
  3. Download Google Apps package (download link here) because the same is not included on the CM10.2 update.
  4. Again, don’t unzip the downloaded file, place them on desktop.
  5. Take the USB cord and by using the same connect your HTC One with the computer.
  6. Select both downloaded files and transfer them on your phone’s SD card.
  7. Remove the USB cable as the computer isn’t useful anymore.
  8. Turn off your phone and wait a few seconds for achieving a proper shut down.
  9. Then, reboot into recovery mode.
  10. From recovery mode, use the menu that is being displayed and wipe the system first.
  11. For a proper wipe select “wipe data factory reset” and “wipe cache partition”; next select “advance” followed by “wipe dalvick cache”.
  12. Return to main menu of recovery.
  13. From there now select “install zip from SD card” and “choose zip from SD card”.
  14. Pick the firmware file; install the same.
  15. When the flashing process stops, return to recovery, repeat the process and apply the Google Apps package in the same way you did for the CM10.2 Android 4.3 update.
  16. Good; finally select “+++go back+++” and “reboot system now”.
  17. If there were problems, resolve the same by using a dedicated step by step guide.
  18. For any other issue use the comments area from below.

So there you have it; that was how you can install the Jelly Bean 4.3 CM10.2 custom ROM firmware on the AT&T HTC One smartphone. This is only the first release of CM10.2 so if you find minor bugs or issues, don’t panic as the problems will soon be removed and resolved. Also, more features will be added on the future, so stay close for receiving further versions of the CyanogenMod platform.

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