HƯỚNG DẪN UNLOCK DOCOMO NEXUS SC-04D

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Guide to Permanently Unlock Samsung Galaxy Nexus SC-04D and Change It to Stock Firmware

Posted onMay 5, 2012
Japanese can buy Samsung Galaxy Nexus (GNex) SC-04D from NTT Docomo cheaply. Users who want to use this phone in other regions face the following problems:
1.It is SIM locked
2.It does not have tethering function
3.It has a different radio baseband and lacks critical features for some other regions, e.g. UMTS 900MHz
Disclaimer: Following this guide voids the warranty, and any mistake in this guide or following this guide could cause your phone to be unusable, bricked. I am not responsible if anything goes wrong. (I have done all these and my SC-04D is working perfectly though.)
I. Install Necessary Drivers in Windows

This section installs the necessary drivers using PDA Net. If for any reason this is not successful, you may try searching for “Samsung USB Driver for Mobile Phones 1.4.6.0″ instead.
1.If you already have other Android ADB drivers installed, it is highly recommended that you uninstall them first. (This is not in the HKEPC guide, but I ran into a driver problem due to having previous Nexus One drivers).

2.Download PDA Net and make sure you choose the correct 32-bit or 64-bit version depending on which Windows you have (Start -> right click Computer -> Properties > System Type)
3.Make sure the phone is not connected to the PC
4.Start PDA Net, choose to uninstall previous drivers if asked
5.Choose Samsung as manufacturer for driver installation
6.Ignore all warnings from Windows about untrusted driver and choose to install it – usually there will be multiple warnings
7.When PDA Net asks you to enable USB Debugging in the phone, tick the checkbox in Galaxy Nexus Settings -> Developer Options -> USB Debugging, then connect it to the PC
8.When asked again to install a driver, choose to install it
9.In the final screen where there are three checkboxes “Connect PDANet after installation”, “Display incoming SMS on computer”, “Hide Tether Usage”, uncheck all of them, then click Finish
10.If you like to verify that the previous steps have been done correctly, in Windows Start -> right click Computer -> Manage -> Device Manager, you should find “SAMSUNG Android ADB Interface” under “SAMSUNG Android Phone”.
11.Disconnect the phone from the PC, and power it off
12.Hold the Volume Up, Down and Power buttons to boot up the phone in Fastboot mode. If done correctly, you’d see a large green “Start” on top and a green android image in the center.
13.Connect the phone to the PC again, such that it installs the drivers for Fastboot mode

14.Hopefully you don’t get any warnings or errors from this. (If you do, uninstall all the Samsung / ADB drivers and retry, or use the alternative Samsung mobile drivers stated above).
15.Unplug the battery from the phone to leave Fastboot mode
II. Unlock Bootloader

This section performs the unlock for Android bootloader (not unlock SIM) such that we can root it.
Unlock wipes all data from the phone. So back up all your phone data first.
1.Download and install Wugfresh Galaxy Nexus Root Toolkit
2.Connect the phone (with USB Debugging enabled) to PC
3.Run the installed toolkit
4.Choose “GSM/HSPA+” as the model
5.Press “Unlock”
6.Following the on-screen instructions. If everything goes well, you’ll see your device being detected so you can input 1 and press Enter.
7.Your phone should go into Fastboot mode. Input 1 and press Enter.
8.The phone should show several paragraphs of text with a “Unlock bootloader?”. Press Volume Up, then press the power button.
9.Wait for the unlock to finish
III. Root

This sections roots your phone, installs ClockworkMod Recovery and superuser.
1.Connect the phone (with USB Debugging enabled) to PC
2.Run the Galaxy Nexus Root Toolkit
3.Choose “GSM/HSPA+” as the model
4.Press “Root”
5.Following the on-screen instructions. If everything goes well, you’ll see your device being detected so you can input 1 and press Enter.
6.Your phone should go into Fastboot mode. Input 1 and press Enter.
7.The toolkit then installs ClockworkMod Recovery. Wait for it to finish then press Enter.
8.Follow the on-screen instructions to boot up your phone in Fastboot mode, go into recovery and install su.zip (all using the Volume Up / Down and Power buttons). (Note: if you’re repeating this section after flashing to 4.0.4, you need the su.zip in the Apps folder, not in the SD root.) During this time do not press the PC keyboard.
9.Finally, choose “reboot system now” in the recovery
10.When the phone is booted up, there should be a “Superuser” app.
11.In the Toolkit where it is still showing the previous instructions, press Enter to perform the final step.
IV. Backup IMEI and ROM

This section is optional. If you feel necessary to backup the IMEI and the ROM in the phone:
1.Install EFSBackup from Play Store and run it.
2.You may also purchase/find Root Explorer to copy the /factory folder to Internal SD.
3.Boot up the phone in Fastboot mode and choose Recovery
4.Choose “backup and restore”, then “backup”. After it is complete, choose “reboot system now”
5.Disable USB Debugging from phone settings
6.Connect the phone to the PC
7.Browse the phone, then copy the following 3 folders/files to PC: clockworkmod, factory, efs_backup_XXXXXX.img
8.Eject the phone and disconnect it from the PC
V. Flash Google Stock Firmware

1.Download a Factory Image for Galaxy Nexus (GSM/HSPA+) from this Google Factory Images for Nexus Phones page. (Choose the standard one without Google Wallet.) Do not
close this web page even after the download is completed.


2.If you have disabled USB Debugging from the phone previously, enable it again
3.Connect the phone (with USB Debugging enabled) to PC
4.Run the Galaxy Nexus Root Toolkit
5.Choose “GSM/HSPA+” as the model
6.Press “Flash Stock + Unroot”
7.Choose “Other/Browse… (Can be used with ANY factory image)”
8.Choose “It has already been downloaded but please properly extract it for me”
9.Press “OK”
10.Choose the downloaded factory image with .tgz file extension, then press “Open”.
11.Switch to the Factory Image web page and copy the MD5 Checksum string, then paste it to the Galaxy Nexus Root Toolkit prompt for MD5.
12.The Toolkit should prompt “Your file is good to extract and flash! Press OK to continue”. Press “OK”.
13.The Toolkit should show “Please be patient while your file extracts…”. Wait for it to finish.
14.If everything goes well, you’ll see your device being detected so you can input 1 and press Enter.
15.Your phone should go into Fastboot mode. Input 1 and press Enter.
16.This starts the firmware flashing. It will take a while and the phone will be rebooted more than once automatically.
17.When this is completed and you gain control of the phone, go to the phone Settings -> About Phone to check the Android version matches the factory image you downloaded.
VI. Unlock Sim

This section unlocks the SIM lock such that the phone can be used with a service provider other than NTT Docomo. (Note: although this procedure talks about FuckDocomoV3.1 I never tried that. I used FuckDocomoV2, Unlock(Forever), then dangerous manual steps to unlock the SIM. The V3.1 is supposed to automate the dangerous steps so that no user error is incurred.)
1.Download this newer version of su.zip that is Android 4.0.4 compatible
2.Download FuckDocomoV3.1.apk from the author page or here
3.Check Phone Settings -> About Phone -> Status -> IMEI, if your IMEI is the generic IMEI 004999010640000 it means your phone has been unlocked previously in a way that loses your real IMEI. If that’s the case, you’d need to read through the the author page above and find out how to restore it to the state of showing a real IMEI – it may possibly involve downloading FuckDocomoV2 and re-locking the SIM, or try the manual steps in Jup’s Grand Theory of Permanent SIM Unlock
4.Connect the phone to PC
5.Create a folder called “Apps” in the phone internal SD
6.Copy the su.zip just downloaded to this Apps folder (The su.zip must NOT be placed in the root of the internal SD because it will be overwritten by the Galaxy Nexus Root Toolkit with an incompatible version)
7.Copy the FuckDocomoV3.1.apk to the Apps folder
8.Perform Root again as described in section III (because your phone is unrooted in section V) but install the su.zip in Apps folder instead of the root
9.In phone Settings -> Security -> Unknown sources, check “Allow installation of non-Market apps”
10.Install ASTRO File Manager from Play Store
11.Run ASTRO and use it to install FuckDocomoV3.1.apk
12.Run FuckDocomoV3.1 and click the button to unlock SIM forever
13.Reboot the phone