I'm trying to flash a TMobile ROM on the i545 to use on TMobile. I have Insane 4.4.4 Hybrid v6 working, but the cell radio is not. I've tried flashing modules (which made the wifi work - I assume that is the module's only function). I have flashed 2 different i545 KK kernels to no effect either. I have it flashed in rom slot 1, should I be overwriting the stock rom slot? I'm running the latest NG6 (came with it updated), but can downgrade to NC5 from my understanding, if needed. I'm not sure what I'm missing to get it working, as I know others have. Thanks.
You don't need to flash a T-mobile ROM, just insert the T-mobile SIM and set the APN.
Edit: just to be clear - the i545 will work on T-mobile, but only on bands that VZ and T-mo have in common.
Flashing some other carrier's ROM won't change what frequencies are supported by the radio hardware.
k1mu said:
You don't need to flash a T-mobile ROM, just insert the T-mobile SIM and set the APN.
Edit: just to be clear - the i545 will work on T-mobile, but only on bands that VZ and T-mo have in common.
Flashing some other carrier's ROM won't change what frequencies are supported by the radio hardware.
Click to expand...
Click to collapse
Thanks. I know this, but I need the wifi calling feature that is only in tmobile ROMs.
Related
Hi,
i own a HTC One S (16GB) device, am running a custom rom (MaximusHD 10.0.1), Android 4.2.2, Htc Sense 5.0, rooted, TWRP 2.7 recovery, HBoot 2.16, Radio 1.20.50.05.16, Carrier is Tmobile, supercid 11111111 and bootloader unlocked. i recently installed maximusHD 10.0.0 everything works fine expect for the network connectivity, i can only make use of 2G (edge) signal but i can't switch to 3G only. Whenever i switch to 3G only my networks goes off but when i switch back to 2G it works perfectly please i would be glad if you guys can help me out
You have the official Tmo version or an international version of the phone? That rom is for the international version and might not be set up to properly utlilize the bands of Tmo service 100 is the first thing that comes to mind.
Confirmed: International version of One S does not utlilize any of the bands for T-Mobile past 2G / Edge.
From HTC's website:
HSPA/WCDMA:2
Europe/Asia: 850/900/2100 MHz
GSM/GPRS/EDGE:
850/900/1800/1900 MHz
T-Mobile HSPA/WCDMA uses a combo of the 1900 Mhz frequency and a combo 1700/2100 AWS band.
I don't know if I get you correctly but if this is what you mean my device displays either GSM OR WCDMA so that mean I have the official tmobile version
I'm confused...you don't know if your phone came from T-Mobile or not?
My HTC one s is from T-Mobile, pls can help with the situation would really appreciate it
Ok. When you installed the rom, did you also install another radio or firmware package as well? As in the one that was listed in the OP of the rom here: http://forum.xda-developers.com/showthread.php?t=2445392 ? If so, that is probably why. The rom and radio are for the international version of your phone, not the one from T-Mobile. Now, obviously the phone are so similar that the software works on both versions. The only difference is the data bands that are supported for 3g/4g and the radios that interface with those bands. So, if you have never changed your radio like it was suggested in the thread for that rom - change your rom to one based off of T-Mobile software. If you have changed the radio, then flash one for the T-mobile version, and you should be fine. If it doesn't work after that, you'll just want to make sure both the rom and radio are for the T-Mobile version.
Thanks man, I think I messed up my device and a newbies to this time installation things. I actually followed the instructions given in the maximushd Rom, I flash the firmware packages with my tmobile version device. Pls what can I do to fix this I need your help
Gbetoyan said:
Thanks man, I think I messed up my device and a newbies to this time installation things. I actually followed the instructions given in the maximushd Rom, I flash the firmware packages with my tmobile version device. Pls what can I do to fix this I need your help
Click to expand...
Click to collapse
Are you S-Off?
If so: http://d-h.st/7V7 - It's a large file with the Aroma Installer to let you pick which radio you want. I believe you'd be looking for the T-Mous 1.13 one. If you aren't S-Off - Don't bother with that.
S-On?
If so, you need to re-lock the bootloader and run the RUU (Rom Update Utility) to get everything back on track, then you can re-unlock the bootloader and redo the recovery and rom stuff. http://www.androidruu.com/getdownlo..._10.30.50.08L_release_309489_signed_ICS_2.exe
Guide: http://androidforums.com/one-s-all-...e-how-run-ruu-your-htc-one-s.html#post5568357
Thanks man i really appreciate your effort and time you have render to me, i will work on the instructions you have given to me and let you aware how things turned out
During the installation of Sense-Radio-Installer-v6.zip i came across where it asking to select either US BUILD.PROPS OR NO EDIT please what does that mean
Hi,
I have a Verizon S4 (SCH-1545) MK2 running Android 4.3. It is rooted and I flashed Hyperdrive 13 via SafeStrap. Then, I switched carriers to AT&T, but I am using the same Verizon S4. I am still running HD13.
I was wondering if I can upgrade to HD 16. I have to upgrade my base to NC5 KitKat 4.4.2 before I can flash HD16. Will me switching carriers have any effect on how I upgrade/root/flash HD16 and all roms in the future?
Thanks
bummppp
pavan94 said:
Hi,
I have a Verizon S4 (SCH-1545) MK2 running Android 4.3. It is rooted and I flashed Hyperdrive 13 via SafeStrap. Then, I switched carriers to AT&T, but I am using the same Verizon S4. I am still running HD13.
I was wondering if I can upgrade to HD 16. I have to upgrade my base to NC5 KitKat 4.4.2 before I can flash HD16. Will me switching carriers have any effect on how I upgrade/root/flash HD16 and all roms in the future?
Thanks
Click to expand...
Click to collapse
Verizon uses CDMA and AT&T uses GSM, you may be able to get Voice working, but I highly doubt you will get an LTE connection since they are different frequencies.
pavan94 said:
Hi,
I have a Verizon S4 (SCH-1545) MK2 running Android 4.3. It is rooted and I flashed Hyperdrive 13 via SafeStrap. Then, I switched carriers to AT&T, but I am using the same Verizon S4. I am still running HD13.
I was wondering if I can upgrade to HD 16. I have to upgrade my base to NC5 KitKat 4.4.2 before I can flash HD16. Will me switching carriers have any effect on how I upgrade/root/flash HD16 and all roms in the future?
Thanks
Click to expand...
Click to collapse
Recently, they unlocked one of the bands of LTE to allow traffic in the Verizon S4. If you check the bands on phonescoops, it will show that is is compatible with one of the LTE bands. In theory, it should get LTE in the major cities that have that band. However, Verizon likes to be stupid and lock their devices.
Verizon:
http://www.phonescoop.com/phones/phone.php?p=4066
GSM:
http://www.phonescoop.com/phones/phone.php?p=4058
Cellular Freqs:
http://en.wikipedia.org/wiki/Cellular_frequencies#United_States_Carrier_Frequency_Use
You will be able to get GSM working on your S4 with EDGE or even 3G data, but LTE is unlikely. Voice and SMS will work fine. You will have to get the APN settings for AT&T and set it up in your phone.
I just got a new unlocked AT&T M8, switched over from iPhone. I'm going to be using it with T-Mobile, and I'm still struggling to learn how all this stuff works. So the phone is running on Android 4.4.4 currently, and I want to install a custom ROM on it, but I need Android 5.0. Since I have a T-Mobile sim card, I don't have any OTA updates. From what I understand, if I wanted to switch to a T-Mobile ROM, I'd have to pay $25 for Sunshine, which I'd rather not do. Would I also need to do so to get an international ROM? Also, from what I'm reading, my other option is to use the AT&T RUU from HTC's website to update to 5.0, and then install a custom ROM from there. Is this correct, would that remove my unlock, and are there instructions/recommended readings before I try anything? Thanks for any help.
grant523 said:
I just got a new unlocked AT&T M8, switched over from iPhone. I'm going to be using it with T-Mobile, and I'm still struggling to learn how all this stuff works. So the phone is running on Android 4.4.4 currently, and I want to install a custom ROM on it, but I need Android 5.0. Since I have a T-Mobile sim card, I don't have any OTA updates. From what I understand, if I wanted to switch to a T-Mobile ROM, I'd have to pay $25 for Sunshine, which I'd rather not do. Would I also need to do so to get an international ROM? Also, from what I'm reading, my other option is to use the AT&T RUU from HTC's website to update to 5.0, and then install a custom ROM from there. Is this correct, would that remove my unlock, and are there instructions/recommended readings before I try anything? Thanks for any help.
Click to expand...
Click to collapse
You probably want the T-Mob radio software, so you can enable the 3G and LTE bands used by T-Mob. Otherwise, you will find that the AT&T radio does not give you 3G and LTE in many locations.
In order to flash another carrier's radio, you need s-off, and there is no way around that. Then you need to change the carrier ID (CID) and model ID (MID) to that of T-Mob.
At that point, you may as well RUU to a stock factory T-Mobile software image (not just the radio) and that would be recommended, is it will get you a complete T-Mobile "baseline" phone as opposed to an AT&T ROM with T-Mob radio, etc.
After running the T-Mob RUU, your phone will be "fully converted" to the T-Mob version in terms of software. Others here have converted the AT&T version for use on T-Mob. So I'll try to find one of those threads instead of trying to explain it all again.
None of these mods will change your SIM unlock. That will remain unlocked.
---------- Post added at 11:06 AM ---------- Previous post was at 10:58 AM ----------
Here you go: http://forum.xda-developers.com/att-htc-one-m8/help/installing-tmobile-rom-att-branded-phone-t3069388
Another point: You can update to the latest AT&T Lollipop software by RUU. And you can flash custom Lollipop ROMs after that. But neither of these will enable the 3G and LTE bands used by T-Mob. So that is why I suggest "converting" the phone to T-Mob stock software instead.
Thanks for the response! Appreciate it. A few more questions, since I'm not sure I fully grasp the concept of radios.
If I first flash a T-Mobile ROM, and then install a custom ROM, is that any different from updating with a AT&T RUU and then installing a custom ROM? Will I still be missing the bands?
If yes, then should I just stay away from Custom ROMs all together? Is this a problem because I bought an AT&T phone?
Thanks again!
grant523 said:
Thanks for the response! Appreciate it. A few more questions, since I'm not sure I fully grasp the concept of radios.
If I first flash a T-Mobile ROM, and then install a custom ROM, is that any different from updating with a AT&T RUU and then installing a custom ROM? Will I still be missing the bands?
If yes, then should I just stay away from Custom ROMs all together? Is this a problem because I bought an AT&T phone?
Thanks again!
Click to expand...
Click to collapse
Yes it's different the AT&T ruu won't give you the T-Mobile bands. And you can install custom roms if you want but I would reccomend paying the $25 to s-off and fully converting to t-mobile and either stay on stock or flash a custom t-mobile rom
grant523 said:
A few more questions, since I'm not sure I fully grasp the concept of radios.
If I first flash a T-Mobile ROM, and then install a custom ROM, is that any different from updating with a AT&T RUU and then installing a custom ROM? Will I still be missing the bands?
Click to expand...
Click to collapse
I think your first phrase was intended to read "flash the T-Mob RUU, then install a custom ROM".
The radio is not contained in the ROM, and flashing a ROM doesn't affect the radio in any way.
The radio is contained in what many folks here called the "firmware package" or firmware.zip; and it can be installed by flashing the RUU.
Another thing that will help you understand, is that the phone has something like 36 (or more) partitions. The ROM is just one of those. The radio is a separate partition (as bootloader, recovery, and others have their own separate partitions as well). Flashing one partition, does not effect the others. The RUU is a complete software image that flashes all the partitions to factory stock for a certain carrier version.
You can also flash the radio or firmware.zip manually (without flashing the whole RUU). But my personal recommendation would be to baseline to a fully stock T-Mobile software profile, since you are on the T-Mob network, to make sure every partition plays well together (as opposed to mixing T-Mob and AT&T software components).
grant523 said:
If yes, then should I just stay away from Custom ROMs all together?
Click to expand...
Click to collapse
I wouldn't say that. Custom ROMs have their place. But a custom ROM will not open up the T-Mob bands. As mentioned, you can only do that by flashing the radio, which isn't affected by flashing the ROM.
After baselining to a T-Mob stock config as I've suggested, you can feel free to flash a custom recovery and flash custom ROMs if you like. But if would be for other reasons than the radio bands; such as performance, customization, debloating, etc..
grant523 said:
Is this a problem because I bought an AT&T phone?
Click to expand...
Click to collapse
Basically yes. If you want to be sure a phone works fully on a certain network "out of the box", you should buy the phone that is branded for that network. Otherwise, you should always thoroughly research a phone (not branded for your carrier) before trying to use it on your network.
Luckily for you, on this device the radio bands can be changed in software using the mods I've noted above. On past devices, the band support was set in hardware, meaning where was no way to change it in software. In that case, you would really have some buyer's remorse to deal with.
Ah OK thanks for the responses! I think I'm starting to understand. I did research how an At&t m8 would work with T-MOBILE but I didn't realize i would have to go throw this whole software process to make it work! Anyhow I appreciate the help and I'll buy a Sunshine license when I get a chance. Thanks again!
You are quite welcome.
Here is a thread with more info on changing from AT&T to T-Mob software: http://forum.xda-developers.com/att-htc-one-m8/help/installing-tmobile-rom-att-branded-phone-t3069388#post60606278
Good luck!
Currently running CM13 on my SCH-i545 with T-Mobile as my carrier.
I was curious if i could maybe flash a T-Mobile ROM with some build.prop editing maybe?
Any ideas?
Hi All, I have unlock ATT version, then switch to T mobile service (flash T mobile firmware). Now I switch to Sprint firmware. HOwever My ATT ver didn't have the band 25 and 26. Only have band 41. Sprint needs all 3 for better connection. Is there away to unlock 25 and 26 band?
Unlock S9 plus vers and other have all bands
sweetboy02125 said:
Hi All, I have unlock ATT version, then switch to T mobile service (flash T mobile firmware). Now I switch to Sprint firmware. HOwever My ATT ver didn't have the band 25 and 26. Only have band 41. Sprint needs all 3 for better connection. Is there away to unlock 25 and 26 band?
Unlock S9 plus vers and other have all bands
Click to expand...
Click to collapse
The G965U and G965U1 are identical hardware wise and all support the same bands. What differentiates the G965U from the G965U1 is the that the G965U1 has the unlocked firmware (non carrier branded if that term makes more sense).
The only thing that differentiates one G965U from another G965U is the firmware. The firmware determines what bands are available as well as custom carrier settings/apps/configurations that is installed. For example if you properly flash the firmware for the Sprint G965U onto the AT&T G965U then it will have all the bands (and sprint customization/bloat) that the Sprint G965U version has.
To give you an example I have the sprint version, flashed it to the unlocked firmware, flashed to AT&T firmware and then finally to T-mobile. I didn't flash it in that order, that is just the different kinds of firmwares I have had on that phone.
Across the different firmware versions all necessary and needed bands were active and working just fine.
scottusa2008 said:
The G965U and G965U1 are identical hardware wise and all support the same bands. What differentiates the G965U from the G965U1 is the that the G965U1 has the unlocked firmware (non carrier branded if that term makes more sense).
The only thing that differentiates one G965U from another G965U is the firmware. The firmware determines what bands are available as well as custom carrier settings/apps/configurations that is installed. For example if you properly flash the firmware for the Sprint G965U onto the AT&T G965U then it will have all the bands (and sprint customization/bloat) that the Sprint G965U version has.
To give you an example I have the sprint version, flashed it to the unlocked firmware, flashed to AT&T firmware and then finally to T-mobile. I didn't flash it in that order, that is just the different kinds of firmwares I have had on that phone.
Across the different firmware versions all necessary and needed bands were active and working just fine.
Click to expand...
Click to collapse
Yes, i put in Sprint Sim on the phone then the phone auto removed the Tmobile apps and installed bunch of Sprint apps. I checked the specs for ATT ver and only see band 41 avail online. After Sprint firmware installed, I check again *#0011# and only see band 41. I was too assumed everything should be identical both S9 plus U or U1 but there must me something got block by ATT and carrier firmwares still can't unlock it.
sweetboy02125 said:
Yes, i put in Sprint Sim on the phone then the phone auto removed the Tmobile apps and installed bunch of Sprint apps. I checked the specs for ATT ver and only see band 41 avail online. After Sprint firmware installed, I check again *#0011# and only see band 41. I was too assumed everything should be identical both S9 plus U or U1 but there must me something got block by ATT and carrier firmwares still can't unlock it.
Click to expand...
Click to collapse
Did you flash the sprint firmware onto the at&t phone you have or did you just insert the sim card and let the phone apply the settings for the sim card?
If you did the latter (specifically just changing the sim card) this doesn't give you any of the carrier specific tweaks/customizations that can be found on the carrier firmware. For thse tweaks/customizations you need to flash the firmware for the carrier branded phone. So your better connection desire will most likely be a sprint firmware specific thing and not found on the at&t firmware.
Also looking up what the at&t branded phone supports and the sprint branded phone supports won't help much. It will only tell you what the two phones are configured to do for the carrier the phone is branded for. Those specs It do not tell you what the hardware can do (or that the hardware is the same whether it be the unlocked version from Samsung, the sprint branded one you buy from sprint or the at&t branded one purchased through at&t).
scottusa2008 said:
Did you flash the sprint firmware onto the at&t phone you have or did you just insert the sim card and let the phone apply the settings for the sim card?
If you did the latter (specifically just changing the sim card) this doesn't give you any of the carrier specific tweaks/customizations that can be found on the carrier firmware. For thse tweaks/customizations you need to flash the firmware for the carrier branded phone. So your better connection desire will most likely be a sprint firmware specific thing and not found on the at&t firmware.
Also looking up what the at&t branded phone supports and the sprint branded phone supports won't help much. It will only tell you what the two phones are configured to do for the carrier the phone is branded for. Those specs It do not tell you what the hardware can do (or that the hardware is the same whether it be the unlocked version from Samsung, the sprint branded one you buy from sprint or the at&t branded one purchased through at&t).
Click to expand...
Click to collapse
This makes sense. I'll will try to flash Sprint firmware on top right now. The reason I said tweaks/customization applied because the whole UI "Settings" of the change completely changed from Tmobile Pie to Sprint Pie (more buttons, header rename...) so I assume tweaks/customizations already applied when Sprint Simcard did its own things
Also I thought the base S9 Pie for U ver all the same. Only when you put the Carrier simcard in then they download their all carrier settings (Not in this case?
sweetboy02125 said:
This makes sense. I'll will try to flash Sprint firmware on top right now. The reason I said tweaks/customization applied because the whole UI "Settings" of the change completely changed from Tmobile Pie to Sprint Pie (more buttons, header rename...) so I assume tweaks/customizations already applied when Sprint Simcard did its own things
Also I thought the base S9 Pie for U ver all the same. Only when you put the Carrier simcard in then they download their all carrier settings (Not in this case?
Click to expand...
Click to collapse
Carrier settings (APN, MMS/SMS settings, PRL, Roaming lists and related) are not quite the same when it comes to bands being enabled/disabled or carrier tweaks/customizations. Also I don't know if the base for the s9+ contains all the full carrier customizations/tweaks or not when it comes to android pie. If I had to guess I would say it probably comes with a somewhat generic one size fits all configuration... Perhaps along the lines of what the U1 firmware has.
Though I would presume that the base does not have all the carrier customizations/tweaks because the carriers release android pie at different times.
As an example (for illustrative purposes to explain my presumption) AT&T releases the new update before T-mobile does. T-mobile releases the update before Verizon does. Because Verizon would have been the last to release the update both AT&T and T-Mobile would not have any of the additions Verizon would have made.
When flashing the sprint firmware onto the AT&T phone you have you may need to flash the U1 firmware first, do a factory data reset and then flash the G965U firmware for sprint. Someone else might have some insight if this is still applicable for Android Pie, but when I flashed from sprint to t-mobile using the Oreo firmware that is the process I had to go through.
scottusa2008 said:
Carrier settings (APN, MMS/SMS settings, PRL, Roaming lists and related) are not quite the same when it comes to bands being enabled/disabled or carrier tweaks/customizations. Also I don't know if the base for the s9+ contains all the full carrier customizations/tweaks or not when it comes to android pie. If I had to guess I would say it probably comes with a somewhat generic one size fits all configuration... Perhaps along the lines of what the U1 firmware has.
Though I would presume that the base does not have all the carrier customizations/tweaks because the carriers release android pie at different times.
As an example (for illustrative purposes to explain my presumption) AT&T releases the new update before T-mobile does. T-mobile releases the update before Verizon does. Because Verizon would have been the last to release the update both AT&T and T-Mobile would not have any of the additions Verizon would have made.
When flashing the sprint firmware onto the AT&T phone you have you may need to flash the U1 firmware first, do a factory data reset and then flash the G965U firmware for sprint. Someone else might have some insight if this is still applicable for Android Pie, but when I flashed from sprint to t-mobile using the Oreo firmware that is the process I had to go through.
Click to expand...
Click to collapse
I would debate on the example (for illustrative purposes to explain my presumption) you had above, I don't think carriers are related. I would think Google/Samsung (Google may give the base to Samsung first then Samsung distribute to each carrier) give each carrier the base then each carrier goes customize their own settings with their own times to release to us.
Yes the correct way to flash to U1 then flash back to be clean (I guess And I did that when switch from ATT to Tmobile) But i have to much to setup again, so may just dirty flash Sprint now
PS: Still can't find the Sprint Pie in Sammobile website. Only Verizon and Tmobile and Generic ver
scottusa2008 said:
Did you flash the sprint firmware onto the at&t phone you have or did you just insert the sim card and let the phone apply the settings for the sim card?
If you did the latter (specifically just changing the sim card) this doesn't give you any of the carrier specific tweaks/customizations that can be found on the carrier firmware. For thse tweaks/customizations you need to flash the firmware for the carrier branded phone. So your better connection desire will most likely be a sprint firmware specific thing and not found on the at&t firmware.
Also looking up what the at&t branded phone supports and the sprint branded phone supports won't help much. It will only tell you what the two phones are configured to do for the carrier the phone is branded for. Those specs It do not tell you what the hardware can do (or that the hardware is the same whether it be the unlocked version from Samsung, the sprint branded one you buy from sprint or the at&t branded one purchased through at&t).
Click to expand...
Click to collapse
Shouldn't have to flash the phone should install the firmware as soon as you install the Sim card
Sent from my SM-G965U1 using Tapatalk
---------- Post added at 02:25 PM ---------- Previous post was at 02:24 PM ----------
sweetboy02125 said:
Hi All, I have unlock ATT version, then switch to T mobile service (flash T mobile firmware). Now I switch to Sprint firmware. HOwever My ATT ver didn't have the band 25 and 26. Only have band 41. Sprint needs all 3 for better connection. Is there away to unlock 25 and 26 band?
Unlock S9 plus vers and other have all bands
Click to expand...
Click to collapse
All models are the same. Their just blocked in att firmware same goes for vzws B13. Your phone will install the firmware when you put in the sim card
Sent from my SM-G965U1 using Tapatalk
tengen31 said:
Shouldn't have to flash the phone should install the firmware as soon as you install the Sim card
Sent from my SM-G965U1 using Tapatalk
---------- Post added at 02:25 PM ---------- Previous post was at 02:24 PM ----------
All models are the same. Their just blocked in att firmware same goes for vzws B13. Your phone will install the firmware when you put in the sim card
Sent from my SM-G965U1 using Tapatalk
Click to expand...
Click to collapse
You are right, I saw 25 and 26 now. Sim card will download and unlock the band needed
sweetboy02125 said:
You are right, I saw 25 and 26 now. Sim card will download and unlock the band needed
Click to expand...
Click to collapse
Yep. My S8 did it,so does my S9+
Sent from my SM-G965U1 using Tapatalk
I am not sure if this would work or not and I haven't done this for a while. I might have the wrong service code or the menu option may have changed with android pie. So if I do someone feel free to correct it.
Note - if you see a message like RAT access/menu isnt allowed (or something like this) power off the phone, take the sim card out and power the phone on without the sim card in it. The process should work then.
*Open the phone app and enter ##DATA# (##3282#)
*Choose edit and if prompted enter a total of siix zeros as the MSL
*Select LTE to edit the active bands
From there you can enable or disable bands. If the band isn't listed you simply cant just add it. I would suggest flashing the carrier firmware as this would have it enabled.
Also I do believe that there are carrier customization/tweaks that may only be on the firmware from the carrier. Swapping the sim may change a few apps, change a few menu items and apply settings from the sim card onto the phone. It also may apply some (or perhaps most) carrier settings. I have not seen anything that gives me cause to believe that it applies all the carrier customization/tweaks.
If that were the case why did my g96u1 (or sprint g965u) firmware not show video calling or get provisioned for it, but flashing the tmobile firmware allowed for the feature to be enabled and provisioned. Also on the tmobile firmware I have had better signal retention and strength (not the signal bars, actual signal strength measurements on the phone) then with the unlocked firmware (or the original firmware that was on the phone with the tmobile sim).
If swapping the sim installs the tmobile firmware then that should have been all it took and I could continue to use the unlocked firmware, but this was not the case. The only features that were enabled were (outside of menu changes and app additions) VoLTE and WiFi calling. Now if this alone indicates carrier firmware specific features/tweaks/customizations can only reside on carrier firmware, then how could one declare it wouldn't also effect what bands are enabled/disabled. Like I said I haven't seen anything that says otherwise, but from what I have seen first hand there are somethings that are apparently only on the carrier's firmware that is not available on the others.