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HTC One S Jelly Bean Development: Unofficial CyanogenMod 10 (CM10) Available [Android 4.1]


There’s a new unofficial CyanogenMod 10 (CM10) ROM based on Jelly Bean Android 4.1 out for the HTC One S, adding another Jelly Bean ROM to the One S’ belt. CyanogenMod ROMs are known for their faster/smoother performance and customization options compared to stock ROMs, and CM10 attempts to brings these features to Jelly Bean, which is already quite fast and smooth compared to previous Android versions. So while HTC spends time on releasing the official Jelly Bean update, owners of the device can get a taste of Jelly Bean with CM10 instead.

One X owners can try out Jelly Bean ROMs → here.

NOTE: The ROM is a work in progress and still in the early stages of development, so expect bugs and issues to be present as well as things that don’t work properly. Also, since CM10 is still under development, not many CyanogenMod customization features are currently present in the ROM.

Currently, following things work/do not work, quoted from official development page (the list may change as development goes on):

What works:

  • Receiving/answering calls
  • Sending/Receiving a mms & sms (
  • Data & Network (although some users report infrequent drops)
  • WiFi, including WiFi-Hotspot
  • Bluetooth, including Tethering and Audio
  • Camera (Photos & Panorama, but introduce a wake-lock. Reboot or suffer a horrible battery drain)
  • GPS
  • Sound (not yet with Headset)
  • USB Mass Storage
  • Notification LED

Not Working/Issues:

  • Plugged-in headphones are not recognized (workaround: App)
  • Video Camera & Camera Wakelock
  • Media Process seems unstable
  • USB tethering
  • Graphical Errors, like in incoming notifications
  • Rotating while in youtube causes soft reboot
  • Screen-Off/On animations are not shown

Let’s see how CM10 can be installed on the HTC One S.


This guide is applicable only for HTC One S. DO NOT try this on any other device.


The methods and procedures discussed here are considered risky and you should not attempt anything if you don’t know completely what it is. If any damage occurs to your device, we won’t be held liable.

How to Install CM10 on HTC One S


  1. This procedure will wipe all your apps, data and settings (but it will NOT touch your SD cards, so don’t worry about those). Backup your Apps and important data — bookmarks, contacts, SMS, APNs (internet settings), etc. This Android backup guide would help you.
    NOTE: Don’t forget to at least make a backup of your APN settings, which you can restore later if your data connection does not work after installing the ROM. Use the backup guide to find out how.
  2. Unlock the bootloader on your One S by following the bootloader unlocking guide for the HTC One X → here. Procedures for both One S and One X are the same, so simply follow what the One X guide says to unlock the bootloader.
  3. Install ClockworkMod (CWM) recovery by following the guide → here.
  4. Download the latest version of the ROM from the official development page.
  5. Download the Google Apps package. This will install apps like Play Store, Gmail, etc. which are not present in the ROM by default.
    Download Gapps  |  Filename:
  6. Copy the two zip files downloaded in step 4 and 5 to the SD card on the phone.
  7. [Backup Current ROM] To be able to return to your current ROM from CM10, make a backup of it (this is different than the backup taken in step 1 as this backs up the whole ROM).
    1. Turn off your phone. Boot into the bootloader mode first by holding the Volume Down button and then pressing power key to turn on device. Then, select RECOVERY from there using the volume buttons to navigate and power button to select to boot into recovery.
      In recovery, use volume button to scroll up/down and the power button to select.
    2. Then, to perform a backup, select Backup and Restore –> On the next screen, select Backup again. Go back to main recovery menu after backup is complete, then select reboot system now to reboot the phone.
  8. Open the downloaded zip file of the ROM and extract the boot.img file from inside it (use a software like WinZip or 7-zip to extract).
  9. Download fastboot.
    Download Fastboot  |  Filename:
  10. Extract the file to the C:\ drive on your computer to get a folder named Fastboot with four files inside it.
  11. Copy the boot.img file extracted in step 8 to the Fastboot folder on C drive. You should have 5 files in the Fastboot folder now.
  12. Switch off the phone. Enter fastboot mode. For that, boot into the bootloader mode first by holding the Volume Down button and then pressing power key. Then, select fastboot mode from there using the volume buttons to navigate and power button to select. Then connect your phone to the computer once you are in fastboot mode.
  13. Open Command Prompt on your computer from Start » All Programs » Accessories.
  14. Now, type the following commands in command prompt to flash the kernel, pressing Enter after each command (Check the screenshot after step 14.3 for reference).
    1. cd c:\Fastboot
    2. fastboot devices (this is to ensure the phone gets detected. A string of numbers and letters should appear if the phone is properly detected, as shown in screenshot below. Else, make sure you have the phone drivers properly installed)
    3. fastboot flash boot boot.img
  15. After the kernel is flashed, you’ll get a finished/OKAY message in command prompt.
  16. Disconnect your phone from the PC.
  17. Now, on your phone select ‘HBOOT’ using the Power button. And then select ‘RECOVERY’ to boot into recovery mode.
    Use volume buttons to scroll up and down and the power button to select options in bootloader menu and recovery.
  18. Select wipe data/factory reset, then select Yes on next screen to confirm. Wait a while till the data wipe is complete.
  19. Select install zip from sdcard, then select choose zip from sdcard. Scroll to the ROM file on the SD card and select it. Confirm installation by selecting Yes – Install on the next screen. The ROM will start installing.
  20. After ROM installation completes, select choose zip from sdcard again, then select the file to install the Google apps package.
  21. After the installation is complete, select go back then select reboot system now to reboot the phone and boot up into CM10.
    NOTE: In order to go back to your previous ROM, boot into recovery (as explained in step 7.1), select backup and restore, then select restore to restore your previous ROM.

CM10, based on Android 4.1 Jelly Bean is now installed and running on your HTC One S. Visit the official development page for more info and to get the latest updates on the ROM. Share your thoughts on the ROM in the comments.

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