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How to Update HTC Desire Z with Android 4.2.1 Jelly Bean CM10.1 Custom Firmware

There is a new alpha stage custom firmware to install on your HTC Desire Z with Android 4.2.1 Jelly Bean.  This ROM is based on CyanogenMod 10.1 while still in development will bring some new Jelly Bean features to your device.  Our guide will take you step by step through the process of updating your HTC Desire Z with Android 4.2.1 Jelly Bean CM 10.1 custom firmware.  This will be a simple procedure if you carefully follow our instructions and take heed of all precautions.   Once completed you will be able to get more life out of your phone as you will have some of the same latest and greatest features that are available on newer devices.

Disclaimer:  This is a custom firmware and requires root access to install.  Doing any of this will likely void any and all warranties.  All downloads are the properties of the respective developers and neither we nor them are responsible for what happens to your device.  Make sure you read carefully.

Firmware Features :

Not only will you get the flexibility to completely customize your phone with Cyanogen Mod but you will also get many enhancements to the user interface and all aspects of your device.   Jelly Bean takes Android to the next level with more intuitive controls for higher productivity.

Backup and Other Precautions :

Back up all data stored on the internal memory of your device.  Make sure your contacts are synced to Gmail or at least exported to your SD card.  Most apps have synchronization options to let you store data in the cloud.  Taking the time to ensure everything is backed up will save you a lot of headaches later.  Don’t forget to back up your wireless network and MMS settings as well.

Make sure your battery is charged to at least 85% ( full charge recommended ) as a power failure during this process can brick your device.

This will require an unlocked bootloader in order to be performed.  If you do not have an unlocked bootloader this will not work for you.  Please research more and come back to us.


Desire Z

How to Install Android 4.2.1 Jelly Bean CM10.1 Custom Firmware on HTC Desire Z

After you have backed up all your important data we can begin the process of flashing the custom firmware to your device.  Please take the time to carefully read all instructions, ensuring that you fully understand them.  You will need to have root access as well as ClockworkMod Recovery installed.

Remember please that this guide is only for the HTC Desire Z.  We cannot guarantee that this unofficial firmware will function on any other device or variants.

Root Warning :  You will need superuser permissions to install this ROM.  Rooting your phone will void most warranties and can possibly expose the uninitiated to increased system vulnerabilities.  We highly recommend a robust security suite for your protection.

Steps to Update :-

  1. Download and install the HTC Desire Z USB Drivers.
  2. Download Android 4.2.1 CM 10.1 Jelly Bean and Google Apps for the HTC Desire Z on your computer.
  3. Enable USB debugging then connect your device to the computer via USB and enable mass storage.
  4. Copy and paste the two files to the root directory ( not in a folder ) of your SD card.
  5. Power down your HTC Desire Z
  6. Press and hold the volume down, home key and power button to get into the bootloader mode.
  7. Make your way through the menu and select BOOTLOADER and select RECOVERY from the next menu.
  8. Once in ClockworkMod Recovery, wipe the data first.  Afterwards, scroll on down to “flash zip from SD card” and select it using the power button.
  9. Then hit the power button again to select “choose zip from SD card”
  10. The volume keys will let you navigate to the Android 4.2.1 ROM zip file then use the power button to select it.  You will be asked to confirm and then the install will begin.
  11. Repeat the last step for the Google Apps file as well.
  12. Once the install is complete, choose “+++++Go Back” to reboot your HTC Desire Z by selecting “reboot system now”  The phone will reboot itself and may take up to 4 or 5 minutes to load the first time.

Now that the upgrade is complete, go into your settings to verify by checking the “About Phone” section.  Restore your backed up data and start checking out all the new features and the interface.

Mike is a software engineer with a love for tinkering with smart phone devices. He spends a lot of time moving pictures to his SD card, because the Android keeps running out of memory. In his spare time, he travels to different parts of the world and takes one of his Android devices with him.


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4 Responses to “How to Update HTC Desire Z with Android 4.2.1 Jelly Bean CM10.1 Custom Firmware”

  1. Georg says:

    Thanks for the tutorial, but one comment:
    In the clockwork mode I had to use the touchpad to navigate. Pressing power button did not select items. Only cleared the screen, showed the logo and nothing happend. But using pad for navigating and selecting worked out well.

  2. cyan says:

    Use the trackpad scroll or the volume keys, the power button is used for back options sometimes.

  3. drnkh says:

    need to s-off or root?
    help me
    i m beginner

  4. bilal says:

    I have been facing problem in bootloader and recovery in htc desire z help me !

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