Tutorial: Upgrade HDC S3 EX 1 GB/Star B92M to Jellybean ROOT

GUIDE: How to Update your HDC Galaxy S3 EX 1 GB to Android 4.1.2 Jellybean ROOTED
How to Update your HDC Galaxy S3 EX 1 GB to Android 4.1.2 Jellybean ROOTED

Files needed (Download link provided)

1. Flash Tool v.312

2. MP_mt77_h958_b92x_pulid_ics_hw_20120925-151115_lixiaoli_PC___
– Android 4.0 Stock ROM
– Flash this ROM first (needed)
– original ROM Android 4.0 (ICS)
– Cable Flash Method

3. hdc galaxy s3 ex 4.1.2_2
– Flash this after the first one
– Android 4.1.2 Jellybean

4. HDC S3 EX V2 True tech infoVersion (
– Flash this last, not cable method,
– stored in phone storage and flash through recovery method

Please Refer to the Video Below for more information



NOTE: Do this at your own risk,  I’ve tested this method on my own phone.

Before you start:

– make sure battery has over 60% or capacity left

– USB Cable connection

– remove SD card

– UNZIP all files needed


Step 1: install the 6575/6577 flashing driver from “MT6575-MT6577±Ø±¸Ë¢»úÇý¶¯×Ô¶¯°²×°°æ” or “MTK6577 Driver and install”.


Step 2: unzip the “ÏßË¢¹¤¾ß”(Flash tool) to your desktop.


Step 3: Open the flash tool.exe and scatter loading, choose “original b92m411”- file necessary- MT6577_Android_scatter_emmc.txt.


Step 4: You will notice a number of files below after step 3.

If the uboot file is missing, pls click “uboot” and choose “1k”, then pls replace ebr1, logo, recovery, under folder “B92M412 Recovery+EBR1+AnimationLogo+logo.bin+Root” ebr1/ logo.img/ recovery.img.


Step 5: Take out all your simcards/ sdcard/ battery of your phone and others connected to your pc.


Step 6: Remember to click firmware upgrade first, and then insert your battery and connect the phone to pc via USB (cable flash) and then leave it alone.

  • the phone will recognize driver, if it shows xx, you can click stop and disconnect the phone and reinstall the driver and restart your pc.
  • successful flash, a green ring can be seen


Step 7: Disconnect the phone and start it up, set your language as english, you may see phone storage is broken when you slide down the notification, click and format the storage and connect again.

  • Afterwards, you have access to USB Storage, Please send the “HDC Galaxy S3 EX True Version” (do not unzip) into your phone storage via USB.


Step 8: Disconnect the phone and enter RECOVERY MODE by simultaneously pressing the power button and the volume UP key for 5 secs. The screen turns black, then you’ll have to press the middle or home button to go to recovery mode.

  • NOTE: if this fails, take out the battery and then do the procedure again. (refer to part 2 video)


Step 9: Volume up and down to choose, power key to confirm. Choose update from sdcard and confirm.

  • Go step by step and reboot your system in the end.


STEP 10, PLEASE FOLLOW PART 2 VIDEO ON HOW TO CONFIGURE AFTER “HDC S3 EX V2 True tech infoVersion” is already flashed.

  • NOTE: Please don’t forget to configure AREA and ZONE – settings for faster GPS lock in

This article has 10 Comments

  1. Thank you!
    FCT provided me with instructions but my phone didn´t communicate. SBROM com error or something. I needed latest flashtool 3.1 to communicate with JB.

    Now a problem. The truetech rom formated the partition table and cahanged it. I only get 512MB internal storage and no phone storage. Tried both clean install and update.
    Any suggestions, otherwise I need to flash back again and stay with the first rom.

    1. Hello,

      Ive tested this on my phone, HDC S3 EX 1 GB, i have to flash it first to the original (although it is a Star B92m ROM), the 2nd is turning it to 4.1.2
      BTW its cable flash – the flash tool is somewhat buggy, sometimes it works and sometimes it there are other flash tool included on the Download so make use of them if one doesnt work – version may be a problem.

      the last is recovery mode flash (ROOT and GPS Fix)
      although ive tested it and i recommend you refer to this site for the gps http://www.youtube.com/watch?v=alpSWotOAYk
      just follow the gps fix (recovery mode flash install) – its a pretty small mode so you still have to download the gps mod (fortunately, it works after 5 to 7 mins lock) better than nothing

      best regards,

      1. Good for you.
        I have the ex v2 and it refuses to flash the original, at least the ones I´ve tried from different sources. I tried the one circulating that fixes 2,5GB internal storage 1gb ram and supposedly the GPS. That rom works fairly I think though gps isn´t that good. ,
        But when I load the trutech version after that, which is supposed for my phone, I only get 512mb storage and 512 mb ram. FCT does not answer me and I can´t find anyone with the problem.

  2. Take a look at this!!!!

    Notice: “HDC Galaxy S3 ex v2 rooted” is a wrong rom from the factory to hdc galaxy s3 ex 1GB ram. System will show just 512M ram and 8MP camera. So this rom now is suitable for s3 ex lte. However, it is okay if s3 ex 1GB wanna flash it and experience the new 4.1.2os . Step by step, there’s no risk. And when the factory releases the right rom, you can flash again, or you do not like showing 512M ram and 8MP camera on your s3 ex 1gb ram version, you can flash back to 4.0 os. If you do not know how to flash it, you can contact me and i will help you.

    MORE INFO: http://www.talkingmobi.com/rom-download-fastcardtech-com-phones/

    1. hello,

      the one on talkingmobi is an old ROM, the three downloads are the new ones designed for 1 GB Star B92m or HDC S3 EX 1 GB.
      first ROM (to make recovery mode), 2nd ROM turns to 4.1.2, 3rd (HDC Galaxy S3 EX V2 1 GB) ROOT

      best regards,

    2. Yes I have found out that HDC Galaxy S3 ex v2 has the wrong ROM. It showed and used only 512mb RAM and drained the battery and no GPS. The phone was crap. My old ZTE Blade was better.

      Yes I tried getting help from your colleague Mohane but his instructions failed and he left me standing there.
      I found other sites explaining JB 4.1.2 needs newer flashing tool.
      I did not succeed in going back to 4.0.4 but I managed to exhange recovery and then flash with another rom giving me 2,5 GB storage, 1GB RAM. “B92M-JellyBean-4.1.2-ROM-GPS-FIX”. Phone works alright.
      I then switched to http://www46.zippyshare.com/d/6916232/18/Root_Superuser_3.1.3_Busybox_1.20.2-Update1-signed.zip

      BUT when I try to load the right ROM : “Truetech…” I only get 512MB ram and 512 mb storage.
      Is it necessary to start with 4.0.4? Can´t see why. It´s the installer that messes with the partition table or what it is called in Android and the RAM issue I don´t know.
      Do I have to do something before upgrading to Truetech? wipe something? reset something? Or is it just a bad ROM?

  3. Hi
    can you update a 512mb ram version stock rom for star b92m ?
    i have bricked my phone
    Please help me
    Thank you very much

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