Develop Bugs

Why flashing a different radio is not chaning my LTE bands?

Guys, I want some opinions on this matter I'm trying to fix.
I bought an Taiwan HTC 10 (M10H) which comes with several LTE bands (not the ones I need).
I'm trying to make this Asian version to work fully as an US unlocked version to get those different bands.
You may have read my posts on this topic on other threads.
But in short, since the unlocked version is the right version for my LTE needs, I unlocked the bootloader and S-OFF the phone to flash RUUs. That went smoothly, and my phone was converted to US-Unlocked (and T-Mobile branded later).
All in hopes of having the very same possibilities, LTE speaking at least (AWS Band is my objective).
But for some reason I'm failing to understand, the LTE bands are locked and not changing after flashing this RUU or the T-Mobile one. I have absolutely the same bands no matter what.
I have also flashed several radios from different versions, but nothing changes.
Failing with the RUUs and Radios, I resorted to changing the LTE Bands with Qualcomm Tools (QPST/QXDM). That failed as well, and it will until we grab a custom -made from scratch- kernel. That remains an open possibility when CM13 is functional.
But I'm still clueless with the failure of flashing RUUs to achieve my needs. If the phone is the same -hardware wise-, why flasing the RUU is not achieving the expected results? (or what is not modifying to prevent my phone to act like an US Unlocked?). I'm not sure what I missing. A hidden partition that remains untouched?
Is there a setting based on my Serial Number? (in my case FA65HBN02308). Because that's pretty much the only value that remains the same after flashing RUUs. Also my phone is still being recognized by windows as an M10H (sometimes just HTC 10). Or maybe this is related with the RIL?
Anyways, you're invited to help

Hello, I guess I'm in a similar situation, I've an HTC 10 bought online which is Unlocked from europe, I'm in México, but it's supposed that LTE works here (Band 4, 1700 MHz) and is supported by the HTC 10. But I can only get 3g and an H symbol. I already went to Telcel (my carrier) to check if it had to do with the chip or apn or something, but no it's the phone.
I unlocked my bootloader, left it S-ON, flashed twrp and super su (following this guide: http://forum.xda-developers.com/htc-10/how-to/guide-root-optionally-s-off-radio-t3373025) and then installed Elemental-X Kernel. I'm on 1.80.401.1

Radio bands are hardware dependent the last I checked. Flashing software wont change the actual radio compatibility. By changing the region, you'll force your phone to get updates with that line, but that's about it.
As for Telcel compatibility, I'm pretty sure that requires AWS LTE. LTE bands need both an uplink and a downlink. Just having one of the two bands (1700) wont make you AWS LTE compatible. You need full AWS B4 (1700/2100).

geotsai said:
Radio bands are hardware dependent the last I checked. Flashing software wont change the actual radio compatibility. By changing the region, you'll force your phone to get updates with that line, but that's about it.
As for Telcel compatibility, I'm pretty sure that requires AWS LTE. LTE bands need both an uplink and a downlink. Just having one of the two bands (1700) wont make you AWS LTE compatible. You need full AWS B4 (1700/2100).
Click to expand...
Click to collapse
According to this site, the phone is fully compatible with the lte band, and is the same model sold internationally. As I mentioned, I unlocked bootloader, flashed recovery, kernel, root (Super Su beta 2.74 I think) could that have disabled the lte?
https://www.frequencycheck.com/carrier-compatibility/pAJDFX/htc-10-lte-a-na-32gb-htc-perfume/telcel-mexico

geotsai said:
Radio bands are hardware dependent the last I checked. Flashing software wont change the actual radio compatibility. By changing the region, you'll force your phone to get updates with that line, but that's about it.
As for Telcel compatibility, I'm pretty sure that requires AWS LTE. LTE bands need both an uplink and a downlink. Just having one of the two bands (1700) wont make you AWS LTE compatible. You need full AWS B4 (1700/2100).
Click to expand...
Click to collapse
Are hardware dependant but this modem supports all LTE bands. Every region just enables and disables needed bands. Of course software can't solve this if your hardware does not support the bands. But the Snapdragon 820 support all the bands. Aside from the display, the rest of the hardware is the very same for every variant (being China the only exception).
Which bands are enabled depends on a set of instructions on Qualcomm NV values.
You can verify this with DFS tools or QXDM from Qualcomm (you need root and Diag Mode also).
The problem so far is that the Qualcomm kernels have an anti-tampering function (source: couple of guides), preventing modifications for GSM. I have already succeded in changing the values for CDMA, and there is another user that has reported the changes to be working on CDMA. But I was unable to do it for GSM. So we have to wait until CM13 works to try this option with a built from scratch kernel.
That still doesn't answer us why I couldn't achieve it. But for eg. mnguyen127 said it worked for him. So confusion continues...(at least for me).

kainanmaki said:
Are hardware dependant but this modem supports all LTE bands. Every region just enables and disables needed bands. Of course software can't solve this if your hardware does not support the bands. But the Snapdragon 820 support all the bands. Aside from the display, the rest of the hardware is the very same for every variant (being China the only exception).
Which bands are enabled depends on a set of instructions on Qualcomm NV values.
You can verify this with DFS tools or QXDM from Qualcomm (you need root and Diag Mode also).
The problem so far is that the Qualcomm kernels have an anti-tampering function (source: couple of guides), preventing modifications for GSM. I have already succeded in changing the values for CDMA, and there is another user that has reported the changes to be working on CDMA. But I was unable to do it for GSM. So we have to wait until CM13 works to try this option with a built from scratch kernel.
That still doesn't answer us why I couldn't achieve it. But for eg. mnguyen127 said it worked for him. So confusion continues...(at least for me).
Click to expand...
Click to collapse
Yeah, I still get Band 4 consistently albeit only in certain areas, which is interesting. The HTC 10 seems to have some interesting default band priorities, so it'll always choose Band 12 over band 4 unless band 12 is unavailable. If I more a mile out of my city to the next city over, all I get is band 4. If I stay in my city, all I get is band 12. I did some experimenting and when I used my LG G3, the phone prioritized band 4. I'm not actually sure if the LG G3 is able to connect to band 12; I just know that it default connects to band 4 in areas where my HTC 10 Taiwan based one won't. Also confirmed with another forum member that his US unlocked phone bought from HTC would default prioritize other lte bands over band 4.
The only methods I used were these: (order might not be perfect)
Fastboot commands
S-OFF
Root
TWRP
Changed MID/CID from Taiwan to US Unlocked
Flashing from 1.3 taiwan to 1.5 U.S Unlocked by using ROM (I think), which caused me to lose root but allowed me to updated to 1.80.617.1 by OTA. Afterwards, I rerooted and installed TWRP (probably some unnecessary extra step but I had to since I realized my radio firmware was out of date with my ROM) and flashed the 1.8 US radios, which updated my radio firmware. I used fastboot to flash the radio firmware, but I didn't do it through download mode. I think I did it through bootloader. I then manually flashed 1.80 firmware which caused me to lose root and TWRP but allowed me to keep my updated radio firmware, my new US unlocked CID/MID, and allows me to receive update directly from HTC on my Taiwan based phone.
I get band 12 and 4 consistently.
Sorry if I couldn't be more helpful

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

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

nice work, thanks for taking the plunge

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!

Can u link that ROM

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.

xdadevnube said:
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.
Click to expand...
Click to collapse
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.

parin11 said:
Can u link that ROM
Click to expand...
Click to collapse
http://forum.xda-developers.com/att-galaxy-s7/how-to/xda-community-love-g930u-t3415875

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.

MrBaltazar said:
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.
Click to expand...
Click to collapse
That happened to me when I rooted on the ufirmware forced to reboot.
Sent from my SM-G930U using XDA-Developers mobile app

MrBaltazar said:
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
Click to expand...
Click to collapse
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

eg2_Justin said:
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
Click to expand...
Click to collapse
Unfortunately no. Bootloader is still locked and we cannot flash custom recoveries at this time.

MrBaltazar said:
Unfortunately no. Bootloader is still locked and we cannot flash custom recoveries at this time.
Click to expand...
Click to collapse
Ahh I figured that was the case

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

XxCyberHackerxX said:
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
Click to expand...
Click to collapse
Have this issue as well on VZW mvno.

Illogi.xbone said:
Have this issue as well on VZW mvno.
Click to expand...
Click to collapse
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)

XxCyberHackerxX said:
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)
Click to expand...
Click to collapse
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.

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.

XxCyberHackerxX said:
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
Click to expand...
Click to collapse
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.

MrBaltazar said:
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.
Click to expand...
Click to collapse
Thanks for the explanation. So at this point what is the point of this method? Does unlocking the band lead to a stronger signal?

XxCyberHackerxX said:
Thanks for the explanation. So at this point what is the point of this method? Does unlocking the band lead to a stronger signal?
Click to expand...
Click to collapse
You unlock the band that AT&T primarily uses for LTE. Much more LTE signal throughout the nation on band 17.

Confused on all the threads for unlocked verse carrier variants - what can you flash?

Here's the situation:
I'd like to take advantage of the Samsung trade-in deal but want to buy the correct phone to give me the most options and i'm finding conflicting things on reddit and even here, can someone answer a few quick questions for me:
1) Can i START with an unlocked S8+ from Samsung and flash the TMO firmware if i want? Or any carrier firmware for that matter (selling purposes)?
2) If the answer is no, you can't start with an unlocked S8+, does that mean i have to get a TMO version of the S8+ to be able to flash the unlocked firmware and/or flash back to the TMO firmware?
3) Lastly; if i get a TMO S8+ and flash the unlocked firmware can i still flash the TMO CP to get 256 and MIMO? I did that with my S7 Edge however i started with a verizon version which was already unlocked - flashed unlocked firmware but TMO modem.
3b) I also saw someone on reddit who said they bought the verizon version, flashed the unlocked, then flashed the tmo.
I appreciate the clarification, there are just so many threads and a lot of different answers it's hard to sort through them.
Thanks in advance.

I have the same question. I ordered my wife a T-Mo S8+, because she doesn't care about unlocked/bloatware, etc.
I ordered myself a US Unlocked version, but now I'm.wondering if I should've ordered a T-Mo version.
Couple reasons:
#1 T-Mo version has RCS and video calling. Not a big deal, but cool nonetheless. Apparently GearVR doesn't work on the unlocked version?
#2 The unlocked version only comes in black. I have a couple options with the T-Mo version and could always flash the unlocked software.
#3 Some people have had issues flashing BACK from the unlocked firmware to T-Mo, so if I want T-Mo firmware on my unlocked version, will I have issues flashing it?
I don't really care about colors. Black is fine. And if I can freely and easily switch back and forth between T-Mo and unlocked firmware on either version of the phone, then it doesn't really matter which one I get. Until I know which firmware works best for me on T-Mo, I'm not sure which version I really want to use.

They fixed the GearVR on the unlocked versions; of the 1000+ posts i read i did see that.
Also, i did find this thread but haven't had time to go through it all:
https://forum.xda-developers.com/galaxy-s8/how-to/switch-to-carrier-firmware-100-t3609487
Based on the title, i would ASSume you could do whatever you'd like. I don't care about RCS or video calling so that's not a big deal to me. I decided to take advantage and nabbed the unlocked version, it was the cheapest and since i can probably find a way to flash whatever i want on it i took the risk. I have a couple old phones that getting $200 in on trade is worth it, i went with the S8+ and will probably do it again using my wife for the S8 trade in. Decide which device i like the best and sell the other.

The trade-in was the main incentive for me too. Coming from Nexus and Pixel I'm used to unlocked devices as well.
And I've been pouring over threads today, but some threads are 100+ pages long, and just too long to read or even search through.

Usually the community finds a way with flashing firmware so i'm confident. I'll come back and update this thread when I get it, the only thing I would like to do is flash the T-mobile CP modem for 256 QAM and 4x4 mimo. Other than that, Unlocked firmware all the way

Mr. Orange 645 said:
I have the same question. I ordered my wife a T-Mo S8+, because she doesn't care about unlocked/bloatware, etc.
I ordered myself a US Unlocked version, but now I'm.wondering if I should've ordered a T-Mo version.
Couple reasons:
#1 T-Mo version has RCS and video calling. Not a big deal, but cool nonetheless. Apparently GearVR doesn't work on the unlocked version?
#2 The unlocked version only comes in black. I have a couple options with the T-Mo version and could always flash the unlocked software.
#3 Some people have had issues flashing BACK from the unlocked firmware to T-Mo, so if I want T-Mo firmware on my unlocked version, will I have issues flashing it?
I don't really care about colors. Black is fine. And if I can freely and easily switch back and forth between T-Mo and unlocked firmware on either version of the phone, then it doesn't really matter which one I get. Until I know which firmware works best for me on T-Mo, I'm not sure which version I really want to use.
Click to expand...
Click to collapse
Same here. I received my S8 plus unlock version. I would like to convert totally to t-mobile. Instructions so confusing though.

jim_0068 said:
Here's the situation:
I'd like to take advantage of the Samsung trade-in deal but want to buy the correct phone to give me the most options and i'm finding conflicting things on reddit and even here, can someone answer a few quick questions for me:
1) Can i START with an unlocked S8+ from Samsung and flash the TMO firmware if i want? Or any carrier firmware for that matter (selling purposes)?
2) If the answer is no, you can't start with an unlocked S8+, does that mean i have to get a TMO version of the S8+ to be able to flash the unlocked firmware and/or flash back to the TMO firmware?
3) Lastly; if i get a TMO S8+ and flash the unlocked firmware can i still flash the TMO CP to get 256 and MIMO? I did that with my S7 Edge however i started with a verizon version which was already unlocked - flashed unlocked firmware but TMO modem.
3b) I also saw someone on reddit who said they bought the verizon version, flashed the unlocked, then flashed the tmo.
I appreciate the clarification, there are just so many threads and a lot of different answers it's hard to sort through them.
Thanks in advance.
Click to expand...
Click to collapse
gotojanoo said:
Same here. I received my S8 plus unlock version. I would like to convert totally to t-mobile. Instructions so confusing though.
Click to expand...
Click to collapse
All you need is the firmware files (BL, AP, CP, and CSC_OYM for new carrier flash, CSC_HOME for manually updating same carrier firmware) for the version you want to move to and the modified odin (prince comsy). A quick search will turn up all you need here on xda. Just like the snapdragon S7 and edge, changing which carrier/unlocked software you have is just a 5-10 minute odin away. All versions are compatible regardless of which carrier/unlocked software you start with. Ignore all of the "how to change to XAA" etc. Just find the modified odin and firmware you want to use and flash.
EDIT: To clairify, all snapdragon software versions are compatible with any snapdragon S8 or S8+.
jim_0068 said:
Usually the community finds a way with flashing firmware so i'm confident. I'll come back and update this thread when I get it, the only thing I would like to do is flash the T-mobile CP modem for 256 QAM and 4x4 mimo. Other than that, Unlocked firmware all the way
Click to expand...
Click to collapse
There's no longer a need to flash the TMO cp. I have flashed the unlocked software on my TMO S8+ and unlike the S7e using the unlocked firmware, CA, 256QAM and 4x4 all work fine. The phone enables these things based on the sim inserted. I did a test with my wife's S7e (unlocked using TMO modem file) and my S8+ side by side and speeds were identical, and my S8+ reports CA using bands 2, 4 and 12. The S7e on the unlocked cp (modem) would not have CA and have slower download speeds.
The only thing you lose is the video calling within the phone app (same as the unlocked S7 and edge) when flashing the U firmware to the S8. But unlike with the S7, since you no longer need to flash the TMO CP file to get 4x4, CA, etc, you can now take OTA's for the unlocked version and do not have to manually flash the newest firmware in odin.

anactoraaron said:
All you need is the firmware files (BL, AP, CP, and CSC_OYM for new carrier flash, CSC_HOME for manually updating same carrier firmware) for the version you want to move to and the modified odin (prince comsy). A quick search will turn up all you need here on xda. Just like the snapdragon S7 and edge, changing which carrier/unlocked software you have is just a 5-10 minute odin away. All versions are compatible regardless of which carrier/unlocked software you start with. Ignore all of the "how to change to XAA" etc. Just find the modified odin and firmware you want to use and flash.
EDIT: To clairify, all snapdragon software versions are compatible with any snapdragon S8 or S8+.
There's no longer a need to flash the TMO cp. I have flashed the unlocked software on my TMO S8+ and unlike the S7e using the unlocked firmware, CA, 256QAM and 4x4 all work fine. The phone enables these things based on the sim inserted. I did a test with my wife's S7e (unlocked using TMO modem file) and my S8+ side by side and speeds were identical, and my S8+ reports CA using bands 2, 4 and 12. The S7e on the unlocked cp (modem) would not have CA and have slower download speeds.
The only thing you lose is the video calling within the phone app (same as the unlocked S7 and edge) when flashing the U firmware to the S8. But unlike with the S7, since you no longer need to flash the TMO CP file to get 4x4, CA, etc, you can now take OTA's for the unlocked version and do not have to manually flash the newest firmware in odin.
Click to expand...
Click to collapse
Infinite Thanks! So based on your post, i'm not going to do anything. I hope your message gets out there because there is a lot of confusion on various sites including Reddit about the CP modem with the S8/S8+.
That's great news.

anactoraaron said:
All you need is the firmware files (BL, AP, CP, and CSC_OYM for new carrier flash, CSC_HOME for manually updating same carrier firmware) for the version you want to move to and the modified odin (prince comsy). A quick search will turn up all you need here on xda. Just like the snapdragon S7 and edge, changing which carrier/unlocked software you have is just a 5-10 minute odin away. All versions are compatible regardless of which carrier/unlocked software you start with. Ignore all of the "how to change to XAA" etc. Just find the modified odin and firmware you want to use and flash.
EDIT: To clairify, all snapdragon software versions are compatible with any snapdragon S8 or S8+.
There's no longer a need to flash the TMO cp. I have flashed the unlocked software on my TMO S8+ and unlike the S7e using the unlocked firmware, CA, 256QAM and 4x4 all work fine. The phone enables these things based on the sim inserted. I did a test with my wife's S7e (unlocked using TMO modem file) and my S8+ side by side and speeds were identical, and my S8+ reports CA using bands 2, 4 and 12. The S7e on the unlocked cp (modem) would not have CA and have slower download speeds.
The only thing you lose is the video calling within the phone app (same as the unlocked S7 and edge) when flashing the U firmware to the S8. But unlike with the S7, since you no longer need to flash the TMO CP file to get 4x4, CA, etc, you can now take OTA's for the unlocked version and do not have to manually flash the newest firmware in odin.
Click to expand...
Click to collapse
Thanks. So finally i flashed tmobile firware on my unocked version s8+. Now i have video calling enabled and also tmobile logo while boot up. As u said i have my end results showing TMB/TMB/XAA NOT TMB/TMB/TMB. But i guess from your post i dont have to worry about it. And also they got rid of enable VoLte toggle but it can be enabled with nova launcher not a big deal.
Sent from my SM-G935T using Tapatalk

anactoraaron said:
All you need is the firmware files (BL, AP, CP, and CSC_OYM for new carrier flash, CSC_HOME for manually updating same carrier firmware) for the version you want to move to and the modified odin (prince comsy). A quick search will turn up all you need here on xda. Just like the snapdragon S7 and edge, changing which carrier/unlocked software you have is just a 5-10 minute odin away. All versions are compatible regardless of which carrier/unlocked software you start with. Ignore all of the "how to change to XAA" etc. Just find the modified odin and firmware you want to use and flash.
EDIT: To clairify, all snapdragon software versions are compatible with any snapdragon S8 or S8+.
There's no longer a need to flash the TMO cp. I have flashed the unlocked software on my TMO S8+ and unlike the S7e using the unlocked firmware, CA, 256QAM and 4x4 all work fine. The phone enables these things based on the sim inserted. I did a test with my wife's S7e (unlocked using TMO modem file) and my S8+ side by side and speeds were identical, and my S8+ reports CA using bands 2, 4 and 12. The S7e on the unlocked cp (modem) would not have CA and have slower download speeds.
The only thing you lose is the video calling within the phone app (same as the unlocked S7 and edge) when flashing the U firmware to the S8. But unlike with the S7, since you no longer need to flash the TMO CP file to get 4x4, CA, etc, you can now take OTA's for the unlocked version and do not have to manually flash the newest firmware in odin.
Click to expand...
Click to collapse
Are you saying that you can't accept OTA updates if you flash a carrier CP with unlocked firmware? Or are you saying that accepting an OTA on unlocked firmware will overwrite the carrier CP?

Can anyone walk me through how to flash from G930u to G930v?

I purchased a Samsung S7 on Amazon, and it was listed as a G930V. However, when I received it, I was disappointed to see that in "Device Info"... it lists it as a Samsung G930U.
From what I understand, this is indicates Unlocked Firmware install, which will prevent me from using Verizon's Visual voicemail and also be unable to use the built in Video calling feature, where you can video call anyone in the Verizon Network.
What I don't get, is why the back panel of the phone has a Verizon Logo, even though apparently it is unlocked. I thought all Verizon branded phones, have the G930v firmware?
Anyways, is it possible to flash the phone to G930 firmware, so I can use the features I want to have access to? Or is it recommended I just return this item and try and buy another G930v? Does anyone have any detailed instructions on how to flash to G930v?
Interestingly, when I checked the IMEI online... it lists the device as a Verizon G930V. I guess someone has previously flashed these to U from V?
ETA: Are there any benefits to sticking with Unlocked firmware? Are there any advantages of G930U over G930v? I know the G930v comes with a bunch of bloatware... but wondering if there are other things that VZW's firmware might handicap?

JFox762 said:
I purchased a Samsung S7 on Amazon, and it was listed as a G930V. However, when I received it, I was disappointed to see that in "Device Info"... it lists it as a Samsung G930U.
From what I understand, this is indicates Unlocked Firmware install, which will prevent me from using Verizon's Visual voicemail and also be unable to use the built in Video calling feature, where you can video call anyone in the Verizon Network.
What I don't get, is why the back panel of the phone has a Verizon Logo, even though apparently it is unlocked. I thought all Verizon branded phones, have the G930v firmware?
Anyways, is it possible to flash the phone to G930 firmware, so I can use the features I want to have access to? Or is it recommended I just return this item and try and buy another G930v? Does anyone have any detailed instructions on how to flash to G930v?
Interestingly, when I checked the IMEI online... it lists the device as a Verizon G930V. I guess someone has previously flashed these to U from V?
ETA: Are there any benefits to sticking with Unlocked firmware? Are there any advantages of G930U over G930v? I know the G930v comes with a bunch of bloatware... but wondering if there are other things that VZW's firmware might handicap?
Click to expand...
Click to collapse
3 weeks late but here are my insights. U firmware has less bloatware than the VZW branded firmware. In general, most people prefer the U firmware over their branded firmware unless, as in your instance, there are certain features only available in branded versions. My guess would be that yours was a VZW that was flashed to U. In all likelihood it shouldn't be too difficult to convert back to VZW, if that's your preference. You'll need to familiarize yourself with Odin flashing and the particulars of matching bootloader numbers for firmware to flash. For an example see link: https://android.stackexchange.com/questions/202491/what-do-the-numbers-and-letters-in-the-samsung-firmware-mean
Hope this helps ...

Question flashing global firmware to unlocked AT&T S22

Hi everyone,
I am planning to get an unlocked S22 (AT&T unlocked, fully paid off) from the USA to my country (India). The box says it is following:
Model: SM-S901U
S/W: S901USQU1AVA7
Even though it is unlocked, i can see the SM-S901U does not support 2 5G bands which are used my in country (unlike the generic unlocked SM-S901U1). My question is that,
1) Since the s22 is basically from samsung, with the carrier models having control over the software, will i be able to flash to the generic unlocked firmware and model SM-S901U1 and get support for the other 5g bands too (i see the generic unlocked version SM-S901U1 has the 2 other bands that i need)?
2) Will the hotspot work and will i be able to recive OTA updates?
3) And the main question, will i require an AT&T SIM for the flashing process?
I was digging around the ultra thread for some info:
OTA and Non-OTA Firmware for S22 Ultra SM-S908U and S22 Ultra SM-S908U1 Versions
See Post #2 and #3 for the Links to the Firmware All of the firmware posted here can be flashed on any U or U1 Device. Each of the firmware's are NOT carrier dependent and only has carrier labels listed in order to have an idea if you might get...
forum.xda-developers.com
If someone can help/guide me, i'd be great!
Thanks and Cheers!

1. You will be able to flash s901u1 firmware (you will need a patched version of Odin to do so) but it still will not have the 5g bands, it's a hardware thing.
2. Hotspot will still work and you will be able to receive OTA updates when on s901u1 firmware.
3. No you will not, even when the phone is locked you will still not require a sim

Kesh2cute said:
1. You will be able to flash s901u1 firmware (you will need a patched version of Odin to do so) but it still will not have the 5g bands, it's a hardware thing.
2. Hotspot will still work and you will be able to receive OTA updates when on s901u1 firmware.
3. No you will not, even when the phone is locked you will still not require a sim
Click to expand...
Click to collapse
Thanks for such a quick reply
I had thought that the bands were locked via firmware (was hoping that samsung gave control to the carriers to control the bands via software). Sadly that doesn't seem to be the case
Since the s901u1 has those bands available (i checked here: https://devicebeast.com/devices/samsung-sm-s901u1-galaxy-s22-5g-uw-dual-sim-td-lte-us-256gb), i guess that will be a better buy for 5G.