How to Install CyanogenMod on the HTC One X ("endeavoru")

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This guide will walk you through the process of taking the One X from stock to having a custom recovery image and the ability to flash the latest version of CyanogenMod.


Modifying or replacing your device's software may void your device's warranty, lead to data loss, hair loss, financial loss, privacy loss, security breaches, or other damage, and therefore must be done entirely at your own risk. No one affiliated with the CyanogenMod project is responsible for your actions. Good luck.

Important Notes

CyanogenMod builds for endeavoru currently do NOT support any bootloader version number below: HBOOT 1.28. As the device is S-ON (security-on bootloader), for a working installation you must extract the boot.img from the installer zip and run fastboot flash boot boot.img from fastboot mode. If you see kernel related changes in the changelog of endeavoru builds, you will need to do this every time you update CM on your phone. Read the Additional Info and Installation sections below for more details.

Unlocking the device


The One X can be unlocked officially via the HTC Dev unlock program. This unlock method may have certain restrictions, such as not being able to flash a kernel via recovery (no longer applicable to 2013+ released devices) or no USB access to sdcard in recovery. Some devices, however, have no other method to install custom firmware.

  1. Configure your computer for fastboot.
  2. Enable USB debugging on the device.
  3. Connect the device to the computer through USB.
  4. From a terminal on a computer, type the following to boot the device into fastboot mode:
    $ adb reboot bootloader
  5. Once the device is in fastboot mode, verify your PC sees the device by typing fastboot devices
    • If you don't see your device serial number, and instead see "<waiting for device>", fastboot is not configured properly on your machine. See fastboot documentation for more info.
    • If you see "no permissions fastboot", try running fastboot as root.
  6. From the same terminal, type the following command to obtain your bootloader unlock token:
    $ fastboot oem get_identifier_token
  7. Visit the HTCDev Bootloader Unlock website and follow the instructions there to obtain your unlock key. If your device does not appear in the drop-down list, select All Other Supported Models.
  8. If the device doesn't automatically reboot, reboot it from the menu. It should now be unlocked.
  9. Since the device resets completely, you will need to re-enable USB debugging on the device to continue.

Installing CyanogenMod from recovery


Some devices do not have removable SD cards. Regardless, there should still be a partition on the device named "/sdcard" that can be used for flashing purposes, even though the contents of /sdcard may actually be in internal storage.

  1. Download the prebuilt release of CyanogenMod you wish to install. (Or if you've built CM yourself, look in the $OUT directory for the .zip.)
    Optional: Download any supplemental 3rd-party applications packages for the device you wish to use.
  2. Place the CyanogenMod rom .zip file on the root of the SD card using adb:
    • Transfer your file(s): adb push /sdcard/
      • If you boot directly to recovery and have an internal sdcard, you may need to run adb shell mount /sdcard or mount data through the recovery menu before transferring.
      • If you see "error: device not found" there is likely a driver issue on the PC.
      • If you see "error: insufficient permissions for device", try "adb kill-server" and then run "adb devices" to see if the device is attached.
      • On some devices, the zip file can be copied to the device using standard USB Mass Storage or MTP support. Boot the device normally and transfer the file to it.
    Optional: Place any supplemental packages (e.g. Google Apps[1] or kernel) .zip file(s) on the root of the SD card.
  3. Boot to recovery mode on the device by holding Vol Up & Power.
  4. Once the device boots into the ClockworkMod Recovery, use the physical volume buttons to move up and down. On most devices, the power button is used to confirm your selection, although for some devices the power button is used as a "back" button to go up one level, in which case the home button is used to confirm the selection.
    Optional/Recommended: Select backup and restore to create a backup of the current installation on the device. If this option is missing, it's likely because the stock ROM has overwritten your custom recovery on boot.
  5. Select the option to wipe data/factory reset.
  6. Select install zip from sdcard.
  7. Select choose zip from sdcard.
  8. Select the CyanogenMod file you placed on the sdcard. You will then need to then confirm that you do wish to flash this file.
    Optional: Install any additional packages you wish using the same method.
  9. Once the installation has finished, return back to the main menu, and select the reboot system now option. The device should now boot into CyanogenMod.


This device, if unlocked with HTC Dev Unlock, MUST have its kernel flashed via fastboot! Extract the boot.img from the rom zip and flash using fastboot flash boot boot.img

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