Change Wimax Frequencies on a Virgin Mobile Samsung Galaxy S2

Instructions gaining root permissions

Basic instructions with build GB28 (should work with all other builds if they have the proper files). For conveniency, all files needed during the process can be downloaded from this link: www.winlab.rutgers.edu/~bronzino/downloads/GS2VM_root.zip

Requirements:

• Windows
• Samsung drivers (included in the zip file)

Instructions:

• Install the modified recovery and root the phone following either this guide ​http://www.rwilco12.com/Files/Devices/Samsung%20Galaxy%20S2%20(Virgin)%20(SPH-D710VMUB)/Tutorials/SPHD710VMUB-Root.php (tested and working) or this guide ​http://forum.xda-developers.com/showthread.php?p=39800311 (not tested personally). As the first has been tested is recommended.

• Flash (through recovery) the proper file for your build from this page ​http://forum.xda-developers.com/showthread.php?t=1921045

• Open a shell session on the phone either using terminal emulator or adb

• Type "getprop ril.MSL" and save the 6 numbers code returned

• Open the dialer and type ##3282#

• Select "view → Wimax". When prompted input the MSL previously retrieved.

• Select "MRU". Long press the only button available and select the "Edit Mru" option. Change the frequency of channel 1 to 259000.

• Go back and select "NAP-ID". Long press the first line and select "Write Napid". Se it to 4451db

The phone is ready to be connected to the GENI WiMax Base Station

NO ROOT METHOD

Requirements:

• Alternative launcher that allows the creation of activities shortcuts such as Nova Launcher (the free version is enough).

Instructions (assuming you have installed Nova Launcher from the market):

• Long press an empty spot in one of your home screens.

• Select "Shortcuts → Activities → WimaxHiddenMenu → WIMAX_CFG" (There are two options for WIMAX_CFG, selects the one with subtitle "napid.Wimax_CFG")

• Open the new icon created in the home screen

• Select "MRU". Long press the only button available and select the "Edit Mru" option. Change the frequency of channel 1 to 259000.

• Go back and select "NAP-ID". Long press the first line and select "Write Napid". Set it to 4451db

The phone is ready to be connected to the GENI WiMax Base Station