Database Users

[Q] is it possible to unlock more LTE band on redmi note 4g LTE?

Got a xiaomi redmi note 4g LTE to play with but unfortunately device only supported FDD-LTE band 1, 3 only. Needed band 2, 4 and 7 to be able to work with tmobile USA LTE network. Any ideas on how to add those values to the phone?

blackysan said:
Got a xiaomi redmi note 4g LTE to play with but unfortunately device only supported FDD-LTE band 1, 3 only. Needed band 2, 4 and 7 to be able to work with tmobile USA LTE network. Any ideas on how to add those values to the phone?
Click to expand...
Click to collapse
No you cannot unlock bands. Bands are hardware based.

marbss said:
No you cannot unlock bands. Bands are hardware based.
Click to expand...
Click to collapse
the hardware was supported. It's a Snapdragon 410 chipset with 4G LTE world mode. it's Xiaomi who didn't add those bands into the baseband modem. I read some XDA threads about unlocking all LTE bands for Qualcomm Snapdragon chips but I couldn't understand how to add thoae NV values and how to get into the USB settings mode in my Xiaomi device. I need someone with experience to look into this and maybe make some step by steo guide for us. Its been done b4 with oneplusone, oppo, Sony, LG, Samsung phones with success so I knew it could be done.

ok i could be wrong. My friend just brought a moto x to australia and used a process or update to open up some more bands on his phone .
similar to this discussion http://forum.xda-developers.com/showpost.php?p=58064666&postcount=16 ???

Install mokee opensource
Sent from my HM NOTE 1LTEW using XDA Free mobile app

jagbir89 said:
Install mokee opensource
Sent from my HM NOTE 1LTEW using XDA Free mobile app
Click to expand...
Click to collapse
The ROM actually unlocks more LTE bands?

jagbir89 said:
Install mokee opensource
Sent from my HM NOTE 1LTEW using XDA Free mobile app
Click to expand...
Click to collapse
I'm having the same issue. Is this a solution?

gqkevyn said:
The ROM actually unlocks more LTE bands?
Click to expand...
Click to collapse
Don't know if you're still wondering, I found out there are two versions of this phone. One is Chinese the other is a Hong Kong version. The Hong Kong version comes out of the box with compatible T-Mobile 4g lte band.
Sent from my Nexus 6
---------- Post added at 12:55 AM ---------- Previous post was at 12:47 AM ----------
gqkevyn said:
The ROM actually unlocks more LTE bands?
Click to expand...
Click to collapse
Oh, and as for ROMs unlocking lte bands. I would try the MIUI 5 global ROM. I haven't had a chance to test myself yet but, I would give it a shot. It's the ROM the Hong Kong version comes with out of the box.
Sent from my Nexus 6

Homer J. Fong said:
Don't know if you're still wondering, I found out there are two versions of this phone. One is Chinese the other is a Hong Kong version. The Hong Kong version comes out of the box with compatible T-Mobile 4g lte band.
Sent from my Nexus 6
---------- Post added at 12:55 AM ---------- Previous post was at 12:47 AM ----------
Oh, and as for ROMs unlocking lte bands. I would try the MIUI 5 global ROM. I haven't had a chance to test myself yet but, I would give it a shot. It's the ROM the Hong Kong version comes with out of the box.
Sent from my Nexus 6
Click to expand...
Click to collapse
how about TDD LTE version? with 2600mhz...i wondering can use it in my country...there's 2 version about our phone,FDD lte and TDD LTE...FDD LTE 1800/2100mhz...and i got TDD version...

Mayoz said:
how about TDD LTE version? with 2600mhz...i wondering can use it in my country...there's 2 version about our phone,FDD lte and TDD LTE...FDD LTE 1800/2100mhz...and i got TDD version...
Click to expand...
Click to collapse
I'm sorry, I'm not too familiar with lte bands outside of the US. However you should check out this forum for the Redmi Note 4g. It's where I got most of my info from.
http://en.miui.com/forum.php?mod=forumdisplay&fid=66&mobile=2
Sent from my Nexus 6

Can I unlock bands with Mokee?

Meerk4t said:
Can I unlock bands with Mokee?
Click to expand...
Click to collapse
I'm still not sure it's possible. I've searched and most people say it's hardware based and ROMs can't change it. If you're already rooted and have custom recovery, you might as well give it a shot and report back.
Sent from my Nexus 6

Same problem here. My carrier uses a LTE frequency not supported by phone. All other carriers are supported, mine is not, frustrating. Installing Mokee (or any other custom ROM, I tried them all) doesn't change a thing. I don't know about MIUI, but don't think it would work.

blackysan said:
the hardware was supported. It's a Snapdragon 410 chipset with 4G LTE world mode. it's Xiaomi who didn't add those bands into the baseband modem. I read some XDA threads about unlocking all LTE bands for Qualcomm Snapdragon chips but I couldn't understand how to add thoae NV values and how to get into the USB settings mode in my Xiaomi device. I need someone with experience to look into this and maybe make some step by steo guide for us. Its been done b4 with oneplusone, oppo, Sony, LG, Samsung phones with success so I knew it could be done.
Click to expand...
Click to collapse
How is it going now? Have you successfully unlocked B7
I want to unlock B20 and went through all the steps from this guide but no luck
But I did LOCKED B7 which is available originally on my Mi NOTE (dual-sim) to see if the value I set into 6828 is working.
you can have a go to unlock B7 I think

GeorgeZZzz said:
How is it going now? Have you successfully unlock B7
I want to unlock B20 and went through all the steps from this guide but no luck
But I did LOCKED B7 which si available originally on my Mi NOTE (dual-sim) to see if the value I set in to 6828 is working.
you can have a go to unlock B7 I think
Click to expand...
Click to collapse
i need more step by step info, with pictures if can, to show me how u did it please. thx in advance......

blackysan said:
i need more step by step info, with pictures if can, to show me how u did it please. thx in advance......
Click to expand...
Click to collapse
I posted a new thread here

Instruction DIAG mode for Redmi note 4g
4pda.ru/forum/index.php?showtopic=611491&st=4620

Cyanogenmod 12 on non LTE version

All instructions i see for installing Cyanogenmod 12 on the note 3 suggests that only the LTE version is supported.
How do i check if my phone is the LTE version? The model number on the '"About" screen just shown SM-N9005.
Can i install it if the model number just says SM-N9005 and can i install it on my phone if it is not the LTE version?
Thanks
Update: i am in the UK with the three network

It should have 4G or LTE printed on the back cover, but correct me if I'm wrong.
-J-

The back cover on mine just has the Samsung logo.

2iggy said:
All instructions i see for installing Cyanogenmod 12 on the note 3 suggests that only the LTE version is supported.
How do i check if my phone is the LTE version? The model number on the '"About" screen just shown SM-N9005.
Can i install it if the model number just says SM-N9005 and can i install it on my phone if it is not the LTE version?
Thanks
Update: i am in the UK with the three network
Click to expand...
Click to collapse
There is no "non-LTE" version of the N9005, that would be the N900.

jisoo said:
There is no "non-LTE" version of the N9005, that would be the N900.
Click to expand...
Click to collapse
So the phone is definitely an LTE even if there is no marking on the phone?

2iggy said:
So the phone is definitely an LTE even if there is no marking on the phone?
Click to expand...
Click to collapse
If it is the N9005, then yes it is the LTE model. However, make sure you are not using the N900 which is 2G/3G only. The two models have completely different chipsets in them and the firmwares are not compatible.

LTE Bands Enabled on SM-G935T With SM-G935A firmware

Has Anyone looked into flashing the AT&T firmware onto the TMobile S7e phone. I switch back to this device from my Note 7 and wanted to see if flashing the AT&T firmware would enable the missing LTE bands on the G935T.
Has anyone flashed the G935U firmware? Did it make the other bands available on your device?
Thanks!

Which bands are you worried about? The latest firmware enables band 12 on top of band 4 when it needs it.

The Root said:
Which bands are you worried about? The latest firmware enables band 12 on top of band 4 when it needs it.
Click to expand...
Click to collapse
Wanted to see if flashing AT&T firmware would activate Band 29 & 30. Or if I went to the G935U firmware it would activate all LTE bands...

From what I can tell those bands are not available to the T-Mobile variant's modem. I'm seeing it's capable (with firmware support) of using 1, 2, 3, 4, 5, 7, 12, 13, & 20.
Sent from my SM-G935T using XDA Premium 4 mobile app

Help me decide what to do now. [NOOB][VS980]

Hello everyone! I recently got a second-hand verizon G2 VS980. I live in India (location is relevant in my case because of this being a US only model). I had ROOT pre-installed and it stays even after factory reset. This indicates that it is NOT stock.
This phone has legit hardware, as in it has all VS980 components. I have checked it. BUT IT HAS THE IMEI OF A D800. Does this mean that i also have the bands of D800 enabled?
Now what i want to do is,
Above all i want this phone rooted and flashed to the latest and most stable ROM atm.
Second, i would like to use 4G LTE on it, here in India. I know that VS980 supports only band 4 and 13. I NEED band 3,5,40. I have trawled the internet for this specific info but to no avail. Does the VS980 has the hardware it takes to use other 4G bands? Or is it manufactured only with band 4 and 13 in mind? The only pieces of little info i came upon was this
jacob019 said:
After spending a few days hacking around with the VS980 (LG G2 Verizon Model) I wish to share some findings.
1. NV edits to the bands will only work with baseband 11A or earlier. All later radios have the NV values hardcoded into the baseband and any changes will be reverted. You can successfully edit the NV values, and they will survive reboot on baseband 11A, but as soon as you install a later baseband they will revert to stock. CM11 works well with 11A. Perhaps binary modification to later basebands would be possible.
2. LTE Band 17 does not appear to be supported by the hardware. I copied all the values from a D801. Android now reports my phone as a GSM model instead of CDMA which is nice, but it just won't connect to LTE Band 17. If I delete band 4, I can't get LTE at all, so I know the settings are having an effect.
Click to expand...
Click to collapse
and this. So i am confused where to start, i currently have a 26A baseband. Is it possible to enable band 3,5 and 40 on VS980?
I found the guides much confusing and complex relative to other devices i had. I am confused what to do first.
Should i flash TWRP first? or
Should i flash stock firmware?
I see that bands can be edited only on baseband 11A or earlier, so should i downgrade to that etc.
I have the phantom touches, and i read that they were gone after a specific update, so can i still get/flash that update with
a 11A baseband?
I do not understand this baseband, bootloader, exploits, and ROM compatiblity things.
I am willing to try even low level edits if someone is able to help and guide me.
Lastly, i just want my VS980 to run a good stable ROM with (if possible) 4G LTE on band 3,5 and/or 20 (India) and NO phantom touches update.
Specs: attached

Bump. Noone?
Can't anyone tell me that does the verizon model even includes hardware capability for 4G band 3,5 and 20? If this gets cleared, more than HALF of my problems will be gone.

ankitkashyap said:
Bump. Noone?
Can't anyone tell me that does the verizon model even includes hardware capability for 4G band 3,5 and 20? If this gets cleared, more than HALF of my problems will be gone.
Click to expand...
Click to collapse
vs980 uses lte band 4 and 13. lte wont work for any other bands unfortunately

theobserver76 said:
vs980 uses lte band 4 and 13. lte wont work for any other bands unfortunately
Click to expand...
Click to collapse
This means that i can't enable/use other bands because the hardware does not exist for any band except 4 and 13. Yes?

ankitkashyap said:
This means that i can't enable/use other bands because the hardware does not exist for any band except 4 and 13. Yes?
Click to expand...
Click to collapse
yep

Thanks for clearing this out.

Sm-g935u oreo

I got the official Oreo on the u firmware, does anyone else have it and what are your thoughts i.e. Battery and screen on time, it seems a little faster to me.

cmlucht said:
I got the official Oreo on the u firmware, does anyone else have it and what are your thoughts i.e. Battery and screen on time, it seems a little faster to me.
Click to expand...
Click to collapse
I just flashed the stock Oreo G935UUEU4CRG2 firmware (Vzw) today. I will run it bone stock for a week and report back. I should be able to tell if there's a significant difference in battery life and performance from the stock V firmware because I've never rooted my S7 edge and have run the stock Verizon firmware since new. With this Oreo U firmware, I do hate how Samsung Pay has that quick launch edge feature at the bottom of the homescreen that can't be removed.

I am very interested in the U version of the firmware . I have the Verizon Galaxy S7 Edge G935V w/ Android 8.0 but use it on Straight Talk with their AT&T sim card.
I had to change it from CDMA to GSM, also had to add a new APN for Straight talk.
It works but the phone is missing LTE bands 12 and 17. Band 17 is used in my area and without it the phone connects
to a different band and its weak in my area.
I am trying to learn if I can put the G935U (AT&T) firmware on the G935V and will I get band 17.
I know band 17 is in my area because of my previous phone of a week ago, Nexus 5.
Would you know if it can be done, and where would I find recent info how to do this
along with what bands and features would be offered or not available.
Thanks,
Ken
tx_dbs_tx said:
I just flashed the stock Oreo G935UUEU4CRG2 firmware (Vzw) today. I will run it bone stock for a week and report back. I should be able to tell if there's a significant difference in battery life and performance from the stock V firmware because I've never rooted my S7 edge and have run the stock Verizon firmware since new. With this Oreo U firmware, I do hate how Samsung Pay has that quick launch edge feature at the bottom of the homescreen that can't be removed.
Click to expand...
Click to collapse

On my G935V, flashed with U Nougat firmware I have received the Oreo U upgrade.
It works great, the only issue is that it reverted the LTE bands to the typical V version bands. I had to re-activate the other LTE bands, just because... I can. My provider is still a Verizon MVNO, and VoLTE is working.
What I like about the Oreo is the Bluetooth codecs - besides the aptX and Samsung HD (UHQ) now Google provided native support for LDAC (Sony). I couldn't wait to get that, because I really wanted my Sony's MDR-1ABT headphones to be used in their full glory (LDAC codec).
PS: To appreciate the quality difference you need to listen to FLAC files.

KenKK said:
I am very interested in the U version of the firmware . I have the Verizon Galaxy S7 Edge G935V w/ Android 8.0 but use it on Straight Talk with their AT&T sim card.
I had to change it from CDMA to GSM, also had to add a new APN for Straight talk.
It works but the phone is missing LTE bands 12 and 17. Band 17 is used in my area and without it the phone connects
to a different band and its weak in my area.
I am trying to learn if I can put the G935U (AT&T) firmware on the G935V and will I get band 17.
I know band 17 is in my area because of my previous phone of a week ago, Nexus 5.
Would you know if it can be done, and where would I find recent info how to do this
along with what bands and features would be offered or not available.
Thanks,
Ken
Click to expand...
Click to collapse
Ken, first check out the supported bands between the Verizon and the AT&T S7 edge in the link below. It will confirm the discrepancy in supported bands between the two models.
https://www.phonemore.com/compare/p...5v-vs-samsung-galaxy-s7-edge-sm-g935a/3296028
Then go to this link and download, extract and Odin flash the AT&T "U" firmware and see if that will open up the AT&T bands for your Verizon S7 edge. It very well might. I think you should also choose the option in Odin to "Clear EFS" before you flash so that it can be rewritten fresh upon bootup with your AT&T sim card. Do this and report back your results. Good luck.
https://updato.com/firmware-archive-select-model?record=0A1AF06A906411E89F15FA163EE8F90B

Thank you for your reply.
I am downloading the firmware G935U (AT&T) firmware now. Its going to take several hours because I am not a member of that download site.
I did he A/B comparison and both phones seem to be identical except for the band coverage. The AT&T has band 12 which from my reading
is 700MHz and it includes the segment band 17 has so if I understand it right if I have band 12 I should be in good shape.
It also seems to have all the bands of the 935V except for band 13. The 935A has actually more bands of coverage.
Could you clear something up for me. Once I do this I am reading I can't go back to the Version S7 Edge G935V.
However would I be able to convert it to one of the other carriers like T-mobile ?
You are the first that stated to check the EFS box.
With ODIN I will be choosing all 4 files but making sure I do NOT choose the HOME file, is that correct?
After flashing are there any other special instructions I need to do or will the phone right after flashing just
need to go through the normal setup along with possible adding the same APN config I am using with it on Straight talk w/ the straight talk AT&T sim?
thank you,
Ken
tx_dbs_tx said:
Ken, first check out the supported bands between the Verizon and the AT&T S7 edge in the link below. It will confirm the discrepancy in supported bands between the two models.
https://www.phonemore.com/compare/p...5v-vs-samsung-galaxy-s7-edge-sm-g935a/3296028
Then go to this link and download, extract and Odin flash the AT&T "U" firmware and see if that will open up the AT&T bands for your Verizon S7 edge. It very well might. I think you should also choose the option in Odin to "Clear EFS" before you flash so that it can be rewritten fresh upon bootup with your AT&T sim card. Do this and report back your results. Good luck.
https://updato.com/firmware-archive-select-model?record=0A1AF06A906411E89F15FA163EE8F90B
Click to expand...
Click to collapse

KenKK said:
Thank you for your reply.
I am downloading the firmware G935U (AT&T) firmware now. Its going to take several hours because I am not a member of that download site.
I did he A/B comparison and both phones seem to be identical except for the band coverage. The AT&T has band 12 which from my reading
is 700MHz and it includes the segment band 17 has so if I understand it right if I have band 12 I should be in good shape.
It also seems to have all the bands of the 935V except for band 13. The 935A has actually more bands of coverage.
Could you clear something up for me. Once I do this I am reading I can't go back to the Version S7 Edge G935V.
However would I be able to convert it to one of the other carriers like T-mobile ?
You are the first that stated to check the EFS box.
With ODIN I will be choosing all 4 files but making sure I do NOT choose the HOME file, is that correct?
After flashing are there any other special instructions I need to do or will the phone right after flashing just
need to go through the normal setup along with possible adding the same APN config I am using with it on Straight talk w/ the straight talk AT&T sim?
thank you,
Ken
Click to expand...
Click to collapse
Yes you can go back to the stock verizon firmware.
There's two csc files in the firmware pack CSC_HOME will not wipe everything and the regular CSC wipes everything. You need to choose the regular CSC so it wipes everything. So backup your internal storage if needed. You may or may not need to manually enter your straight talk APN. Your SIM and APN should be detected upon first boot. Just make sure you choose the regular CSC file and not the CSC_HOME. You want to wipe everything and start fresh. If your APN doesn't automatically populate after flashing the rom then enter it manually. You should have no problems with this version of the U firmware.

G935V to G935U (AT&T)
If its written I have not found it yet but it would be nice to have a before and after as far as what you will gain and what you will loose after the firmware flash. It would cut down
on all the follow up questions, especially for me.
After flashing, you said I can return to stock firmware. Its strange I am reading you cannot return due to a BL that will not be compatible anymore with the Verizon firmware.
The G935V has been taking updates when it was on Verizon. Will this continue after changing it from a G935V (Verizon) to a G935U (AT&T) while on Straight Talk with their AT&T sim?
Does this G935U (AT&T) flash change any specific characteristics of the phone like its serial number and model #? I ask because the Samsung Smart Switch program besides
backing up your phone can also return it to stock (in case something corrupts it) and I am wondering if I give it the current serial# and model number G935V, will there be any problems since its model number firmware will be different.
I was advised when using ODIN under "Options" to check "Phone EFS Clear" . Does this still sound right. All other settings should stay as is.
Thank you,
Ken
tx_dbs_tx said:
Yes you can go back to the stock verizon firmware.
There's two csc files in the firmware pack CSC_HOME will not wipe everything and the regular CSC wipes everything. You need to choose the regular CSC so it wipes everything. So backup your internal storage if needed. You may or may not need to manually enter your straight talk APN. Your SIM and APN should be detected upon first boot. Just make sure you choose the regular CSC file and not the CSC_HOME. You want to wipe everything and start fresh. If your APN doesn't automatically populate after flashing the rom then enter it manually. You should have no problems with this version of the U firmware.
Click to expand...
Click to collapse

Q: After flashing, you said I can return to stock firmware. Its strange I am reading you cannot return due to a BL that will not be compatible anymore with the Verizon firmware.
A: When you flash a different U.S. firmware it has a bootloader included in the firmware. They can be flashed between the different U.S. firmware with no issue. the only time you may not be able to flash a firmware and bootloader is when you attempt to "downgrade your firmware to an earlier version.
Q: The G935V has been taking updates when it was on Verizon. Will this continue after changing it from a G935V (Verizon) to a G935U (AT&T) while on Straight Talk with their AT&T sim?
A: Yes, but the updates may not come as often as the carrier version of the firmwares such as Verizon, sprint, T-Mobile or AT&T. But you will get updates. It seems the carrier firmware will bring more frequent security patch updates than the "U" firmware.
Q: Does this G935U (AT&T) flash change any specific characteristics of the phone like its serial number and model #? I ask because the Samsung Smart Switch program besides
backing up your phone can also return it to stock (in case something corrupts it) and I am wondering if I give it the current serial# and model number G935V, will there be any problems since its model number firmware will be different.
A: No. The model#, IMEI, etc will not be affected. Only the software version will be affected as well as carrier specific update compatibility will be lost due to the "U" firmware.
Q: I was advised when using ODIN under "Options" to check "Phone EFS Clear" . Does this still sound right. All other settings should stay as is.
A: Yes. If you are having issues with network configs, you can choose to wipe efs so that it will rebuild upon first boot of the new firmware. This is only recommended if you have issues connecting to the network. Otherwise don't do it.

Since I'm on a roll I have another quesiton,
I dd a side by side comparison on this site
https://www.phonemore.com/compare/p...5u-vs-samsung-galaxy-s7-edge-sm-g935a/5532054
The phone called G935U has several more bands than the 935A (AT&T). Would this be a different G935U flash as compared
to the G935U (AT&T) ? If so would that not be the firmware to go with? It covers CDMA as well as GSM with the extra GSM bands.
This would be very similar to my G935V which offers CDMA and GSM.
Do I have it right NO CDMA capabilities on the G935U (AT&T) firmware?
Thank you for your replies its been very helpful. Its been a mystery trying to find out
what features you end up with with G935U and if their is a non provider version like in the above link.
Thank you
Ken
tx_dbs_tx said:
Q: After flashing, you said I can return to stock firmware. Its strange I am reading you cannot return due to a BL that will not be compatible anymore with the Verizon firmware.
A: When you flash a different U.S. firmware it has a bootloader included in the firmware. They can be flashed between the different U.S. firmware with no issue. the only time you may not be able to flash a firmware and bootloader is when you attempt to "downgrade your firmware to an earlier version.
Q: The G935V has been taking updates when it was on Verizon. Will this continue after changing it from a G935V (Verizon) to a G935U (AT&T) while on Straight Talk with their AT&T sim?
A: Yes, but the updates may not come as often as the carrier version of the firmwares such as Verizon, sprint, T-Mobile or AT&T. But you will get updates. It seems the carrier firmware will bring more frequent security patch updates than the "U" firmware.
Q: Does this G935U (AT&T) flash change any specific characteristics of the phone like its serial number and model #? I ask because the Samsung Smart Switch program besides
backing up your phone can also return it to stock (in case something corrupts it) and I am wondering if I give it the current serial# and model number G935V, will there be any problems since its model number firmware will be different.
A: No. The model#, IMEI, etc will not be affected. Only the software version will be affected as well as carrier specific update compatibility will be lost due to the "U" firmware.
Q: I was advised when using ODIN under "Options" to check "Phone EFS Clear" . Does this still sound right. All other settings should stay as is.
A: Yes. If you are having issues with network configs, you can choose to wipe efs so that it will rebuild upon first boot of the new firmware. This is only recommended if you have issues connecting to the network. Otherwise don't do it.
Click to expand...
Click to collapse

G935U Product Code USC vs. G935U (AT&T
Last night I flashed my G935U. It took 3 tries with the 3rd working after switching to a different ODIN reversion.
The phone works fine, no issues except I am disappointed I lost all the CDMA capabilities should I want to try straight talk with a Verizon sim.
After I flashed the file from the updato.com site I searched and found another G935U with Product Code USC. USA
https://updato.com/firmware-archive-select-model?record=05B44581906411E89F15FA163EE8F90B
A little more research and I found this is the unbranded version (correct me if I am wrong) The unbranded version appears
to retain CDMA plus have more GSM bands than the G935U (AT&T)
Could anyone offer some details on this firmware and could I have flashed this instead of the G935U (AT&T) to have retained
the CDMA and get more GSM bands.
Thanks, Ken
tx_dbs_tx said:
Ken, first check out the supported bands between the Verizon and the AT&T S7 edge in the link below. It will confirm the discrepancy in supported bands between the two models.
https://www.phonemore.com/compare/p...5v-vs-samsung-galaxy-s7-edge-sm-g935a/3296028
Then go to this link and download, extract and Odin flash the AT&T "U" firmware and see if that will open up the AT&T bands for your Verizon S7 edge. It very well might. I think you should also choose the option in Odin to "Clear EFS" before you flash so that it can be rewritten fresh upon bootup with your AT&T sim card. Do this and report back your results. Good luck.
https://updato.com/firmware-archive-select-model?record=0A1AF06A906411E89F15FA163EE8F90B
Click to expand...
Click to collapse

In my experience flashing another version will not add the bands. My case - I have flashed the "U" version on my "V" branded S7 Edge and the bands remained for Verizon. The modem firmware will read something that is flashed in the modem hardware and activate only those bands. There is a way to force other bands (see below).
More so, having the "U" Nougat, with modded LTE bands, I got the "U" Oreo upgrade from Samsung. After the upgrade to the "U" Oreo, the LTE bands reverted to the "V" ones (I had to re-enable them again).
I did "force" in the NV the new bands on my V using QPST and QXD professional Qualcomm tools, but since I don't really have a T-Mobile SIM I can't verify if the change works or it is something hardware (like RF amps) that is really missing.
How to: https://forum.xda-developers.com/galaxy-s5/general/how-to-add-rf-lte-frequency-bands-to-t2886059
The stock value for the "V" hardware, in the NV cell #6828 is 4190. That corresponds to LTE bands 2,3,4,5,7,13 (check with the LTE calculator).
I have changed the value to 2062440470751 that corresponds to bands 1,2,3,4,5,7,8,12,13,20,25,26,29,30,38,39,40,41 (close to what U would have natively). Again, I couldn't test if the software change is sufficient for them to actually work, but I have a feeling it does not.
When I traveled recently to EU, I have used cellmapper to check the LTE bands. I never saw B20, even if, on the map of that country, B20 was available in that rural location. I had only 3G.

G935U vs G935U
I posted the wrong link
This is the one I have my question on
https://www.phonemore.com/compare/p...5u-vs-samsung-galaxy-s7-edge-sm-g935a/5532054
This compares a G935U vs. a G935A
To get to the chase, what firmware would I flash to get the features of the G935U (left picture)
I just flashed my phone with the G935U (AT&T) and although it works fine with no AT&T bloatware it is missing
some of the GSM bands of the G935U (Left picture) and all of the CDMA bands.
Thank you,
Ken

Like I said above, the different firmware does NOT change the LTE bands.

KenKK said:
Last night I flashed my G935U. It took 3 tries with the 3rd working after switching to a different ODIN reversion.
The phone works fine, no issues except I am disappointed I lost all the CDMA capabilities should I want to try straight talk with a Verizon sim.
After I flashed the file from the updato.com site I searched and found another G935U with Product Code USC. USA
https://updato.com/firmware-archive-select-model?record=05B44581906411E89F15FA163EE8F90B
A little more research and I found this is the unbranded version (correct me if I am wrong) The unbranded version appears
to retain CDMA plus have more GSM bands than the G935U (AT&T)
Could anyone offer some details on this firmware and could I have flashed this instead of the G935U (AT&T) to have retained
the CDMA and get more GSM bands.
Thanks, Ken
Click to expand...
Click to collapse
G935U with Product Code USC is the "U.S. Cellular" network. I believe the way it works is the software will use the installed SIM to configure the network compatibility mode that will be available in network settings. The true "U" model of the S7 edge will have hard coded support for whichever bands samsung determines for that model number. The different versions of the "U" firmware are specific for whichever carrier/network the phone will be used on. I'm not sure which firmware would allow both GSM and CDMA networks to function simultaneously, but there is an app in google Play store called "network mode" and you could give it a try and see if it will open up simultaneous GSM/CDMA support in your network settings. I do know that Sprint's firmware does have GSM and CDMA support and I'm familiar with that because I have had sprint for nearly 10 years and have a lot of experience with the samsung software as I've built several ROM's including port ROM's over the past few years. Try the Sprint "XAS" firmware. That's the global version.