Install CyanogenMod (CM) 10.1 M1 ROM for T-Mobile Samsung Galaxy S3 T999

CM10.1 Nightlties Android 4.2.2 available now

T-Mobile Samsung Galaxy S3 has received its own version of CM 10.1 M1 ROM and now you can learn how to flash it on your device without losing any important data. Read the entire post and you will be able to install all files at your first attempt.

The ‘M’ comes from ‘monthly’ / ‘milestone’ terms and it is the stable variant of the first series of CM 10.1 Nightlies. It packs all features of Android 4.2.1 along with tons of new CyanogenMod-based ones. The Google Now is fully integrated and it might amaze you with all its functions. Also, the battery life is improved with this new ROM and you shouldn’t have any problems with keeping up a full day of medium usage.

M-Series is the stable version of the Nightlies builds of CM 10.1 and it should be released on a monthly basis. It will eventually ‘grow’ into RC ( release candidate ) version and then to ‘Final build’. Users of Galaxy S3 T999 and enthusiasts of CyanogenMod team’s work should really give it a try as it won’t disappoint you. It packs tons of features and if you’ve never tried the Vanilla Android 4.2 JB combined with CM 10.1 then this would be the time for that.

If you plan on installing this new ROM on your smartphone, then you will need to read the guidelines listed below and learn how to correctly configure the phone. Here’s what you need to know before flashing CM 10.1 M1 ROM on your T-Mobile Samsung Galaxy S3:

  • Install this new ROM only on the T-Mobile variant of Samsung Galaxy S3 T999. Do not install it on any other variant of the Galaxy S3.
  • Your phone has to be on unlocked bootloader, rooted and running custom Recovery image. These are required in order to push the new OS and Google Apps on your device.
  • Create a full NANDROID backup of your current OS. This will create a restore point for your device so that in case something goes wrong and you can’t boot your device, then you will be able to restore it to its previous working point.
  • Move all your important on to the internal Sd card. If you plan to backup SMS, Call Logs use the following tools: SMS backup & restore | Call Logs backup & restore | APN Settings Backup & Restore | AppBack for Android application. Some of these tools will ask for root access and you need to grant it.
  • Sync the People / Contacts app with your Gmail account. It will save all the data from your Contacts. After installing the new ROM you will have to enter the same Google Account and restore the data.
  • Enable USB debugging options from the Android Developer Options.
  • Charge the phone’s battery until it reaches at least 50% in power levels. This will prevent it from powering off during the installation.
  • This is a guide for Android advanced users and you shouldn’t attempt to install the new OS if you’re a novice. Use the comments section to ask for extra help. We will try to come up with a solution to any problems that you might stumble.
  • Read the whole tutorial and begin to flash the new ROM only when you’re sure that you can complete it and, make sure that you don’t skip any steps that I’ve listed

All the guidelines above should help you complete the installation.

NOTE: if you already use a CM10.1 based ROM then you can skip the ‘wipe data/ factory reset’ step. If you can’t complete the install or the phone doesn’t boot after installing it, then you should ‘factory reset’ the device. Use the comments section to ask for extra help.

How to install the CM 10.1 M1 ROM on the Samsung Galaxy S3 T-Mobile T999:

  1. Download the CM10.1 M1 ROM from HERE. Save the file on your PC and don’t unzip its contents.
  2. Download Gapps for CM 10.1 from HERE. This is the file that needs to be flashed in order for you to get the full Android experience. Don’t extract its contents.
  3. Connect your smartphone to your PC and then move both files on to its internal SDcard. Disconnect the phone from computer.
  4. Power off the PC.
  5. Boot your device into CWM or any other custom Recovery mode. Do it by pressing Volume Up, Home and Power. Release the buttons when the custom Recovery mode boots on.
  6. Select the ‘backup and restore’ option in order to create a full NANDROID backup of your current ROM. NOTE: if you already have such backup file then you can skip this step.
  7. Select ‘wipe data/ factory reset’ option now. Confirm this process.
  8. Select ‘install zip from sdcard’ and then select ‘choose zip from sdcard’. Find the ‘CM10.1 M1. ROM zip and install it.
  9. Select once again ‘choose zip from SDcard’ and then flash the Gapps zip. Confirm.
  10. When both zip files are installed with success, return to the main Custom Recovery menu.
  11. Select ‘reboot system now’ and wait until the first boot process with the new OS completes.
  12. Enter your Google Account details when the welcome screen appears.’
  13. Test the CM10.1 M-series build 1 and tell us in comments which are its best functions and features.

I think that these were all the steps that you had to go over. Now you can begin to test all the new features.

NOTE: In case the ROM doesn’t install at your first attempt, then you should repeat the entire tutorial once again after you power off the device. Remember to apply the step 7 and factory reset the device. Don’t skip any steps listed and you should be able to flash all the files successfully.

You can keep this new ROM updated using the ‘CyanogenMod Updates’ buttons under the ‘About phone’ menu. Those new updates will be Nightly Builds and it might not be as stable as this M-Series CM10.1 release. If you have any other questions regarding CyanogenMod 10.1 M Series, Nightly, Release Candidate or Final builds then you can post them in our comments field.

Samsung Galaxy S3 Articles

  • roman

    Why does my phone say installation aborted?
    i have a gs3 sgh-t999v

    • TMOTECH

      I got the same thing with my I747… :-( Rooted and all but will not install. And because this is an ATT model I am using on T-Mobile I cannot even get the regular JB update.
      Stuck in ICS Please Help!!!

  • KMarkP

    Me, too. It gives me a “Status 7″ message and “Installation aborted.” Should I try a different ROM?