SUCCESS:: LTE Band 17 (AT&T / MVNO) working on G930v

[MrBaltazar]

Hello, All.

I've successfully completed my quest in getting my Verizon Galaxy S7 to work with AT&T's primary LTE band; Band 17.

At first I was using the PE1 firmware with root. I first used Phone INFO (for Samsung) app to access the service code 2263. On PE1, only the factory Verizon-supplied bands were showing as supported. Band 12/17 were not showing in the service menu.

I took my chances and flashed the G930U firmware (found on the AT&T S7 forum of all things) and booted the phone with my AT&T SIM card. I ran LTE Discovery and achieved profit. Band 17 was working with the same signal as the iPhone 6S the SIM card came out of.

Also, the 930U firmware completely debrands the phone, which is perfect since I'll be using it on AT&T. After I confirmed band 17 I proceeded to root using the normal method of flashing the engboot and installing the root/SuperSU package per the root instructions. I did not use the Verizon PE1 debloater/fixes .zip files to make necessary tweaks, post root. I performed the tweaks manually (wifi fix, CPU governer: interactive, and SecurityLogAgent) .. Let me know if I'm missing anything in those regards please.

The ONLY thing I can't do now is view all the LTE bands in 2263 Service Mode. I get a "RAT Selection option: is restricted".. I want to see if all LTE bands are unlocked now. If you know of another way to see all the supported LTE bands, please let me know!

I now have exactly what I was set out to accomplish and it's great. The S7 is replacing my iPhone 6S on AT&T and I will be buying a Note 7 to replace the S7 on Verizon. If/when root is achieved on the Note 7 I will do the same and replace the Note 7 on Verizon with the iPhone 7 (I cycle my personal/business phones as a guilty pleasure if you can't tell already)

Screen shots attached

 

[d33dvb]

nice work, thanks for taking the plunge

 

[Stormwing]

Just did the same on a friend's S7 that he was trying to get on Cricket's LTE, as the VZW firmware kept him on HSPA+ at most. All I had to do was flash the AT&T firmware and bam, LTE. I forgot to check what band it was on but at least it's an additional proof of concept.

Thanks for the info!

 

[parin11]

Can u link that ROM

 

[xdadevnube]

I haven't tried with Samsung, however, most phones with Qualcomm modems can be accessed via QXDM or similar PC software. Often the so called hacked HTC modem driver will allow QXDM to communicate with the phone.
There are XDA threads detailing how to access the appropriate LTE bands and selecting bands of choice using the above method.
AT&T and VzW both use bands 2 and 4, so you probably have all the bands that you need covered already.

 

[MrBaltazar]

I haven't tried with Samsung, however, most phones with Qualcomm modems can be accessed via QXDM or similar PC software. Often the so called hacked HTC modem driver will allow QXDM to communicate with the phone.
There are XDA threads detailing how to access the appropriate LTE bands and selecting bands of choice using the above method.
AT&T and VzW both use bands 2 and 4, so you probably have all the bands that you need covered already.

The factory Verizon firmware did NOT have LTE band 12 or 17 unlocked so I was only getting HSPA+ with little spurts of band 2/4 LTE every once in a while with the AT&T SIM card in it. Flashing the 930U unlocked band 12/17 for me so I have full LTE coverage in the same spots where I only had HSPA+ before.

 

[MrBaltazar]

Can u link that ROM

http://forum.xda-developers.com/att-galaxy-s7/how-to/xda-community-love-g930u-t3415875

 

[MrBaltazar]

One thing to note also is that the G930U firmware auto detects your carrier settings and has you restart after first boot. I'm assuming it will unlock correct bands depending on the carrier SIM you use. The G930U firmware does NOT, however, like the Verizon SIM. Upon updating carrier settings with a Verizon SIM installed, the device will reboot into recovery. Every time you power on the device it will prompt you to update the carrier settings and will have you reboot again.. back into recovery. Rinse and repeat. I had to refresh the U firmware to get my band 12/17 back after putting the Verizon SIM in.

 

[ickedmel]

One thing to note also is that the G930U firmware auto detects your carrier settings and has you restart after first boot. I'm assuming it will unlock correct bands depending on the carrier SIM you use. The G930U firmware does NOT, however, like the Verizon SIM. Upon updating carrier settings with a Verizon SIM installed, the device will reboot into recovery. Every time you power on the device it will prompt you to update the carrier settings and will have you reboot again.. back into recovery. Rinse and repeat. I had to refresh the U firmware to get my band 12/17 back after putting the Verizon SIM in.

That happened to me when I rooted on the ufirmware forced to reboot.

Sent from my SM-G930U using XDA-Developers mobile app

 

[eg2_Justin]

Hello, All.

I've successfully completed my quest in getting my Verizon Galaxy S7 to work with AT&T's primary LTE band; Band 17.

At first I was using the PE1 firmware with root. I first used Phone INFO (for Samsung) app to access the service code 2263. On PE1, only the factory Verizon-supplied bands were showing as supported. Band 12/17 were not showing in the service menu.

I took my chances and flashed the G930U firmware (found on the AT&T S7 forum of all things) and booted the phone with my AT&T SIM card. I ran LTE Discovery and achieved profit. Band 17 was working with the same signal as the iPhone 6S the SIM card came out of.

Also, the 930U firmware completely debrands the phone, which is perfect since I'll be using it on AT&T. After I confirmed band 17 I proceeded to root using the normal method of flashing the engboot and installing the root/SuperSU package per the root instructions. I did not use the Verizon PE1 debloater/fixes .zip files to make necessary tweaks, post root. I performed the tweaks manually (wifi fix, CPU governer: interactive, and SecurityLogAgent) .. Let me know if I'm missing anything in those regards please.

The ONLY thing I can't do now is view all the LTE bands in 2263 Service Mode. I get a "RAT Selection option: is restricted".. I want to see if all LTE bands are unlocked now. If you know of another way to see all the supported LTE bands, please let me know!

I now have exactly what I was set out to accomplish and it's great. The S7 is replacing my iPhone 6S on AT&T and I will be buying a Note 7 to replace the S7 on Verizon. If/when root is achieved on the Note 7 I will do the same and replace the Note 7 on Verizon with the iPhone 7 (I cycle my personal/business phones as a guilty pleasure if you can't tell already)

Screen shots attached

With flashing the 930u firmware being possible would it be possible to then get twrp recovery working? Debating on trying just because I have an extra s7

 

[MrBaltazar]

With flashing the 930u firmware being possible would it be possible to then get twrp recovery working? Debating on trying just because I have an extra s7

Unfortunately no. Bootloader is still locked and we cannot flash custom recoveries at this time.

 

[eg2_Justin]

Unfortunately no. Bootloader is still locked and we cannot flash custom recoveries at this time.

Ahh I figured that was the case

 

[XxCyberHackerxX]

Currently on stock. I get LTE with a att sim card until i place a call then it reverts to 3G. Any known issues with this method? I would really enjoy having full LTE coverage if possible

 

[Illogi.xbone]

Currently on stock. I get LTE with a att sim card until i place a call then it reverts to 3G. Any known issues with this method? I would really enjoy having full LTE coverage if possible

Have this issue as well on VZW mvno.

 

[XxCyberHackerxX]

Have this issue as well on VZW mvno.

I'm hoping this method can eliminate that issue. I just need multiple people to confirm this works (too scared to try it without feedback)

 

[Illogi.xbone]

I'm hoping this method can eliminate that issue. I just need multiple people to confirm this works (too scared to try it without feedback)

The issue I have is with the U Firmware. However, the method does not trip knox. Make a Smartswitch backup and give it a go. If it still doesn't work flash back to AT&T stock and restore from your backup.

 

[boxxyfied]

OP: if you haven't been able to allow the RAT selection i'd suggest this.

go to Service mode main menu (either broadcast cmd 27663368378 or app like shortcut master), 2. ue setting > 1. setting > 1. protocol > 5. sim > 4. EF_RAT Free Supporting > 1. EF rat free supporting on (select even if it shows on)> now RAT Free Support.

Then business as usual.

 

[MrBaltazar]

Currently on stock. I get LTE with a att sim card until i place a call then it reverts to 3G. Any known issues with this method? I would really enjoy having full LTE coverage if possible

Your call is being transmitted over LTE so the data reverts back to Hspa during the call. Mine does this but returns to LTE after I hang up.

 

[XxCyberHackerxX]

Your call is being transmitted over LTE so the data reverts back to Hspa during the call. Mine does this but returns to LTE after I hang up.

Thanks for the explanation. So at this point what is the point of this method? Does unlocking the band lead to a stronger signal?

 

[MrBaltazar]

Thanks for the explanation. So at this point what is the point of this method? Does unlocking the band lead to a stronger signal?

You unlock the band that AT&T primarily uses for LTE. Much more LTE signal throughout the nation on band 17.