[T-Mobile Samsung Galaxy S7 Guides, News, & Discuss] Theandroidguy99:
This guide is meant to assist people in converting their S7 G930T to a G930U with Wi-Fi Calling/VoLTE. All files are hosted on Google Drive and there will be a stock firmware folder in case you would like to flash back for any reason. Let's begin.

Prerequisites:​

You must have the firmware version that ends in APK1, if unsure, check the build number

If you do not have it, please update your phone

Download the firmware files, drivers, and ODIN from the Google Drive link

Have a Windows based PC

Your Micro-USB cable

Backup your data, it will wipe the phone

I AM NOT RESPONSIBLE IF YOUR PHONE BECOMES A BRICK OR LOSS OF DATA. If it does brick, I will do my best to help you. Everything is in my Google Drive because Sammobile does not have the needed T-Mobile firmware.​

Download:https://drive.google.com/open?id=0B1xbKGqj7KwBSXFFRzdtTG1SdVE

Step 1: Driver Installation and Verification

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After you have downloaded all files, run the S7Drivers.exe. This driver is straight from Samsung and was renamed due to keeping things a bit more simple. After you run through the setup, plug in your phone while it is still turned on, go to Device Manager on your PC, and verify the S7 is showing up under portable devices as "Samsung Galaxy S7" (look at the image below if unsure what it will look like). We need the drivers to make sure the phone will be detected in ODIN when we put it in download mode.

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Step 2: Extracting and Running ODIN (Thanks Princecomsy)

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Create a folder on the desktop named "ODIN". Extract the "Odin3+v3.12+(PrinceComsy).zip" to that location. After you have done so, run the "Odin PrinceComsy" application and make sure you see a screen like the one below. Do not close ODIN.

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Step 3: Adding all the files to ODIN​

Download all firmware files and make a folder on the desktop called "S7 Firmware". Make sure the all files there are 4 file in the folder that start with "AP, BL, CP, and CSC". Also, verify that the CP file says "CP_G930TUVUAPK1..." , this is the radio and we need the G930T radio to keep Wi-Fi Calling and VoLTE. Now go back to ODIN and click on the button labeled "BL" and it will bring up the file explorer window. Navigate to the "S7 Firmware" folder and select the BL file. Make sure you match all files with the with the button you clicked on, for example, match AP with an AP file. DO this for all EXCEPT the UMS button, we don't need that. Refer to pictures below for an example of the files. Adding the AP file will take a bit especially if you are using a hard drive.

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Step 4: Put the S7 in Download Mode​

Turn off your phone completely. Now hold power + home + volume down until it brings up a screen that says "Warning". Press the volume up to continue and you will see a screen that says "Downloading... Do not turn off target" Now plug your phone into a USB port, USB 2.0 is preferred for compatibility. You will see a blue box come up in the top left corner of ODIN that says "COM(X)" (X represents a number, it doesn't matter what your number is).

Step 5: Flashing the Firmware​

Now that all the files in ODIN are prepared and the phone is plugged in, we can begin flashing! Just press start and let ODIN do the work. It takes about 5 minutes to flash and another 5 minutes to boot. It takes a minute to get past the installing applications. It should fully boot and you will land on the normal setup screen.

If this tutorial helped you, please feel free to give thanks :D.

Feel free to tell me your experience and/or leave screenshots.

If you need help, the fastest way to contact me would be by PM, I will try to respond that same day.

Stock Firmware will be added by 1/9/16

Screenshots:

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