[Sprint Samsung Galaxy S7 Guides, News, & Discussio] micallan_17:
Enabling additional LTE Bands on the Galaxy S7 with U firmware (Root not required) (North American Qualcomm S7)
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In this guide, I will guide you on the steps that are needed to enable additional LTE bands on your SM-G930U device and allow you to use LTE if your carrier uses an LTE band that is not supported out of the box by the U firmware. This guide may work for the Sprint, T-Mobile, AT&T, Verizon, US Cellular and Tracfone variants of the S7. For this guide, I will enable LTE band 17 for use with my local carrier here in Belize.

Ready? Cool!

Disclaimers:

I am not responsible for any bricked devices

Even though this process does not void or trip Knox warranty, you can never be too sure of what can happen, these steps have been done multiple times by me and have not experienced any issues at all.

Follow this guide at your own risk.

Things you will need:

1.	Windows PC (Windows Vista, Windows 7/8/10)

2.	USB Data Cable

3.	USB 2.0 Port (have not tried on a USB 3.0 Port)

4.	Samsung USB Drivers

5.	Install (disconnect your PC from Internet once installed) CDMA Tool

6.	USA Sim Card (Can be from AT&T, T-Mobile, or Tracfone, have not tried with Verizon or Sprint SIMs) With the Android Oreo Update, you no longer need to insert a US based sim card, to enable Diagnostic Mode, just dial *#0808#.

Procedures:

1.	Eject your Sim card if it’s not one of the above (If you have a SIM from one of above carriers, skip this step) (UPDATE 8/6/2018, NO LONGER NEEDED TO INSERT US BASED SIM CARD IF YOU ARE ON ANDROID OREO)

2.	Insert an AT&T, T-Mobile or Tracfone SIM and wait a few seconds, a pop-up like this one will appear, tap OK. Your Device will reboot after a few minutes. (UPDATE 8/6/2018, NO LONGER NEEDED TO INSERT US BASED SIM CARD IF YOU ARE ON ANDROID OREO)

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3.	Once Reboot, go to the phone dialer, enter *#0808#, a USB Settings screen like this will appear. Click your home button to go directly to your home screen, do not click back.

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4.	Remove Sim Card, insert your carrier sim and reboot the device without closing the USB Settings (if your carrier is one of the above skip this step)

5.	Once rebooted, click on the app switcher, select usb settings app, tap on DM + MODEM + ADB, tap Reboot. (do not close the USB Settings app yet you will need it again)

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PC STEPS

6.	Once booted, connect device to PC, wait for it to install all the drivers, verify it on device manager.

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7.	At this point you should be disconnected from your internet connection. MUST DISCONNECT!

8.	Fire up DFS Tools folder on your desktop, double click on Qualcomm Tool

9.	It will ask for login but ignore it, select your Samsung Mobile USB Serial port to connect DFS to your device.

10.	Click Band Tab>LTE tab>click read, click read again.

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11.	Check your LTE band you want to enable (do note that some of these bands may not work. For this guide, I will be enabling LTE band 17 (700).

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12.	Click on write, click yes/ok on warning diag, wait for timer to go down and it writes the changes to your device.

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13.	Reboot your S7, connect it again to DFS and verify band was written successfully to the NV by going back to the LTE tab and clicking “read”.

14.	If the band you enabled stays checked, disconnect your device at this point from PC, if the check goes away, it may mean that band is not supported in the U firmware.

15.	Dial *#0011# and verify your device is connected to LTE. See below images:

17. Switch to the USB settings app, select MTP, Tap reboot. Once booted again you can now close it.

18.	Say thanks if successful.

Before:

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After:

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