Friday, April 13, 2012

How to unlock Samsung Galaxy S2 T-Mobile T989 with Z3X Box

The following is a guide to unlock the T-Mobile Samsung Galaxy S II with Z3X box. I have verified the steps below on Android 2.3.6 (not rooted) and it worked for me. It's not easy to get it right because of lack of information available elsewhere. 

  1. Connect Z3X box to PC via USB
  2. Dial *#7284# on the phone, choose Modem for USB
  3. Dial *#9090# on the phone, choose USB Diag and then reboot the phone
  4. Connect T-Mobile Samsung Galaxy S 2 T989 to PC via a different USB port.
  5. Select model T989 in samsung tool 12.1.
  6. Click read info. There may be up to 3 more serial ports show up in the list in Samsung Tool
  7. Try select one of the serial port and then click unlock. If it does not work, try the next one. One of them should work
  8. If you see "Reading Security... Error Access Denied" when attempting to unlock, try a different serial port. If none of the serial ports work, try root the t-mobile Galaxy S2 Hercules phone with this guide
  9. Congratulations, now you have just unlocked your T-Mobile Samsung Galaxy S2!

To verify whether it's unlocked or not, just pop in a sim card from another carrier (for example, AT&T), and reboot the phone. If the phone is not unlocked, it will prompt you for unlock code upon startup. 

Note:

  • It does not require the phone to be rooted. I managed to unlock it on both rooted and unrooted phones
  • It works on 2.3.6 Android. I have not tried other versions.
  • It works on Samsung Tool 12.1. Samsung tool 12.2 may have issues showing its unlocked but in fact it's not.

Does it work for you? Please leave a comment if this helped you unlock your phone.

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