yashsingh1/xdaforums huggingface dataset:
[Windows Phone 8 General] rainking430:
Yes, I can confirm on my phones that VoLTE is effected. Several others have reported the same thing.
[Windows Phone 8 General] kravmama1:
Band 12 VOLTE works for me Build 10.10586.218
[Windows Phone 8 General] KYJoe:
If I buy a brand new AT&T Go Phone and it has never been powered on with the AT&T sim card.....and AT&T reports to me the phone is already unlocked...

Can I follow this process and be able to use it on T-Mobile or is it still going to ask me for the unlock code??
[Windows Phone 8 General] Ankit11:
Problem with debranding lumia 640

I did something wrong.....

instead of debranding, first I updates my phone to windows 10 preview.

Now problem is that i am not able to roll it back to windows 8.

I tried soft, hard resetting, even tried windows recovery tool............

CAN YOU PLEASE HELP ME WITH THIS???

CAN I DEBRAND IT EVEN WITH WINDOWS 10???
[Windows Phone 8 General] jamssx:
Just install WDRT and plug your phone in. It will tell you that the version on the phone is higher than the version on the server. Just tell it to install anyway and you will be back to 8.1.
[Windows Phone 8 General] Ankit11:
i tried doing that so many times.......what it does is that it restores the windows 10 as brand new........

Not going back to 8.1
[Windows Phone 8 General] vjchopra:
Debranding possible on AT&T locked 640?

I successfully debranded a lumia 640 now running RM-1073 VAR LTA AR CV SKD. Thanks to you all guys for doing this hard work.

I have another Lumia 640 which is locked to AT&T and they are not giving the unlock code since I turned the phone on with the AT&T sim for a short while.

Is it possible to debrand and flash another ROM on locked phone or does it have to be sim unlocked first.

Thanks in advance.
[Windows Phone 8 General] vjchopra:
Thanks for your wonderful post. I debranded on lumia 640 successfully following your instructions.

Is it possible to debrand a lumia 640 that is still locked to at&t or does it have to be unlocked first.
[Windows Phone 8 General] ma678:
Yes, you can debrand it regardless if it's unlocked.
[Windows Phone 8 General] ram130:
Hey, Anyone flashed Windows 10 using the Insider app and still have band 12? I can't get Band 12 to work at all.
[Windows Phone 8 General] pizzaboy192:
The easiest way to test if it's already unlocked is to power it on with a T-mobile SIM card in, and the AT&T ROM. Remove the AT&T SIM before powering on. If it accepts the T-Mobile SIM and doesn't throw any errors, you can use this process just fine.
[Windows Phone 8 General] KYJoe:
Yep thanks pizzaboy. I just couldn't figure out why AT&T would say it was unlocked when it clearly wasn't because it was asking for an unlock code.

Its all good.

---------- Post added at 09:00 PM ---------- Previous post was at 08:57 PM ----------

I just unlocked, debranded, flashed firmware over to T-Mobile and then upgraded to Windows 10. How can I tell if Band 12 is working or not. What can i do to see if I can help test/try things to help you?
[Windows Phone 8 General] vjchopra:
Thanks. That means if I debrand, it it will also get unlocked from AT&T. No need to ask AT&T for an unlock code then???
[Windows Phone 8 General] papasurf:
No, you still have to go through AT&T for the unlock code.
[Windows Phone 8 General] sachin.gokhale:
I have messaged you solution.
[Windows Phone 8 General] promy65:
If i flash the international variant of windows 8.1 rom on ATT Lumia 640 will i be avle to update to windows 10 mobile ?

WIndows 10 mobile has already released for International variants . Carrier variants still no update.
[Windows Phone 8 General] cbosdell:
I've tried this on two computers running Windows 10 now and get the same error on both:

[1] Started device 5b9aaa7dc4b399b02947f2e539e274eb
[1] Transferring files started
[1] Transferred file 1/3
[1] Transferred file 2/3
[1] Transferred file 3/3
[1] Transferring files complete: 3 files
[1] Installation failed (HRESULT = 0x80004005)
[1] Failed (0x80004005)

ERROR: 0x80004005

Command failed. (HRESULT = 0x80004005)

My AT&T Lumia 640 is unlocked and running Windows 10 Insider Preview if that matters. Does anyone have any suggestions please?
[Windows Phone 8 General] angomy:
Have you tried rolling back to Win 8.1 before completing the de-branding process? AFAIK you're supposed to have it at 8.1 prior to following the steps on OP's post.
[Windows Phone 8 General] cbosdell:
I just tried using Windows Device Recovery Tool to roll back to 8.1 twice and both times got the error: Operation Ended with Failure

Is there another way to roll back?
[Windows Phone 8 General] kravmama1:
Potential wifi calling fix and official Windows 10 mobile update for T-Mobile Lumia 640 expected in the near future. The wifi calling issue is an incompatibility problem between the driver for the 640 and Windows 10. For a full explanation, see post by Travis:

http://answers.microsoft.com/en-us/insider/forum/insider_wintp-insider_call/wifi-calling-and-ims-connection-build-10166-and/1ea2a4b5-9b2d-46ad-a3ad-e160686766f4?auth=1

It appears that they found a solution and are going through testing. Once testing is complete, they will push out both the driver update and Windows 10 upgrade. See post on page 17 of that thread.

Keeping my fingers crossed that this rolls out by June.
[Windows Phone 8 General] vjchopra:
So that is two different people saying two different things. Can anyone please clarify if carrier unlocking is a must before debranding the AT&T locked Lumia 640.
[Windows Phone 8 General] kravmama1:
Actually, the posts are not contradictory. You can debrand without unlocking the phone. But debranding the phone will not unlock the phone. This means that if you debrand the phone and flash a T-Mobile ROM, you will still not be able to use a T-Mobile SIM in the phone unless you get it unlocked from AT&T.
[Windows Phone 8 General] angomy:
Try swapping both the USB port you're using on computer and the USB cable (read that some people getting that error with the WDRT fixed the issue that way.) YMMV.

---------- Post added at 12:27 AM ---------- Previous post was at 12:25 AM ----------

That thread for the wifi driver fix was from last year, I'm kind of worried that they haven't updated with a new post when it's 4 months into 2016 already. I wonder if T-mobile is even going to bother considering it's discontinued selling the Lumia 640's officially.
[Windows Phone 8 General] kravmama1:
Actually, although the thread started last year, Travis from MSFT posted his update about the driver fix and T-Mobile testing on March 30, 2016. You can find his post on page 15 of the thread.
[Windows Phone 8 General] angomy:
Thanks, I only saw that he replied Nov 2015 and somehow missed his newest when scanning further down the thread the first time I read it. I'm glad they're still onboard for releasing the fix, at least on the MS end.
[Windows Phone 8 General] boonesmi:
did you do the nvi update? its not mentioned in the original post, but it was discovered later that band 12 wont work without it.

for more info check the "most thanked" section on the right. (its the all time most thanked post)

---------- Post added at 12:57 AM ---------- Previous post was at 12:49 AM ----------

the best way i know of to test band 12 is:

go to an area with known band 12 signal

dial ##3282# to enter field test

go to settings and disable all band except for band 12.

if it connects then band 12 works.

also you can check the earfcn in field test. if its 5035 then you are connected to band 12
[Windows Phone 8 General] atuarre:
This is useless now if you get the devices from Walmart because they are running Windows mobile 10 out of the box.
[Windows Phone 8 General] boonesmi:
that seems odd to me. i wouldn't expect walmarts stock to have been manufactured recently enough for win10 to even be possible.

also im pretty sure you can use wdrt to downgrade to 8.1.
[Windows Phone 8 General] pizzaboy192:
You can also interop unlock 10 and edit the registry to a different platform ID and flash that way.
[Windows Phone 8 General] shasen1235:
Just want to ask is it possible to flash RM-1113 rom on RM-1073?

I've found a 10240 build rom for RM-1113 and want to use it for trying Android apk
[Windows Phone 8 General] higonp:
Help

Went through the process with 2 At&t lumia 640 LTE's Both successfully debranded and flashed with T-MOBILE Rom but neither has the wi-fi calling app and the app is also blocked from download in the microsoft store anyone else have this problem, solution?

Edit: Well reading page 13 I guess there is no separate wifi calling app now? It is in sim settings and uses wifi automatically if available?
[Windows Phone 8 General] VlabDev:
Ohh.. thanks a lot!
[Windows Phone 8 General] rainking430:
The app is not needed, it's baked into the firmware if I understand it correctly. If you are on 8/8.1, you can go into SIM settings and enable it there. If you are on W10M, there is a problem currently that is causing wifi calling not to work. MS has said they will be issuing a firmware update at some point. And in fact, in the latest Redstone builds the toggle under SIM settings is completely gone. I'm assuming it will return once the firmware is fixed.

Sorry, didn't see your edit till after the fact. Yes, that is correct.
[Windows Phone 8 General] BeyondtheTech:
Can anyone confirm that there are retail Lumia 640's with Windows 10 Mobile already? Does it say so on the packaging?

Since T-Mobile is still dragging their knuckles to release a Windows 10 Mobile update for the 640, has anyone gone the Insider route already, and is it stable enough to use? What works/doesn't work?
[Windows Phone 8 General] papasurf:
You have proof of that? If so please post it. Over at AT&T official forums people who have the L640 have not got any official Win 10 mobile update from AT&T.
[Windows Phone 8 General] Mayaa:
I used those command too, but it doesn't work. My phone is unstable.
[Windows Phone 8 General] ITechStoneman:
sachin.gokhale can you please email me the solution to ATT unlock stonenan4504 at Hotmail dot com please
[Windows Phone 8 General] sachin.gokhale:
I have replied you
[Windows Phone 8 General] nartex2:
I am using Win 10 on rebranded Att go 640 with T-Mo. Works great. Not my daily driver I also have One Plus One used daily. The Lumia gets better reception than my OPO and I live in San Diego so band 12 isn't rolled out yet. Great little phone with Win 10.
[Windows Phone 8 General] BeyondtheTech:
I just did the Fast Insider Ring and did the same thing, but I can't even get the flashlight to work by itself or in the camera app. Can the phone be downgraded back to Windows 8.1 Mobile?
[Windows Phone 8 General] ram130:
Yes. Just follow the thread instructions for flashing the file.
[Windows Phone 8 General] ram130:
Thanks man. I missed that. I just did the flash. Works great. The OP should update the post with this.
[Windows Phone 8 General] boonesmi:
no prob :)

also i didn't notice that you mentioned win10 until after i had posted. band 12 works great in win 8.1 (assuming the nvi update parameter was included) but win10 has problems with band 12. its a known issue and apparently microsoft engineers have identified the problem and found a solution. from what i understand they are waiting for tmobile to approve it, and eventually a firmware update should fix it.
[Windows Phone 8 General] mewcatchew:
[/INDENT]

3. Download and install the tools that contain the iutool. Found [

There are 2 folders with 2 different setup.exe which am I installing - both? I've flashed the T-Mobile variant numerous times but first time with at&t variant. Sorry if this has already been answered, cant find it. I will be flashing to a T-Mobile ROM

EDIT: Did some googling and https://www.youtube.com/watch?v=cDcOoVCp3gE this guy has a much smaller file version to get iutool. Although I didn't find this guide so easy to understand, it works and now have band 12. installing w10 as we speak, and as I don't use the wifi calling feature (I'm reading it doesn't work on w10) I'm as happy as a clam.​
[Windows Phone 8 General] papasurf:
I tried and tried all of this stuff (error city) and finally settled with an unlocked 640 on the T-Mobile network and later added WM 10. I did delete the AT&T bloat. No band 12 but I have another phone for that. I have successfully rooted Android phones over the years but hit a wall trying this. I have 3 new-in-box L640's just in case someone comes up with a sure fire one click install for the whole thing. Maybe my older Win 10 laptop could be part of the problem or my choice of USB cable.​
[Windows Phone 8 General] ram130:
Thanks. Actually had flashed using that command you gave and didn't realize it would reset it until after it was flashing and I read on. But. It was a good experience. Once the flash was done I had band 12 and I upgraded to w10. Did a reset and I got to test the restore process. Finally a good experience on that, they fixed most of the bugs I had before.

So far I've locked band 12 and haven't had a issue. Everything works. I switched it back to auto band switching and its switching to band 12 as expected. Wifi calling also works no issue. It stops now and then after a restart but haven't tested it fully to comment on consistency. I know Microsoft is working on a fix.

Either way I'm a happy WP now.
[Windows Phone 8 General] mewcatchew:
The AT&T 640 works great on the T-Mobile network, honestly not a lot of need to flash it to a T-Mobile ROM. But band does 12 significantly improve LTE connectivity in my neck of the woods though, for the rare occasions im out at a school play or at the hospital for a routine visit, and I will have 2 or 3 LTE bars and my GF's Verizon 6s plus will have no connectivity at all. Maybe the wrong forum, but the AT&T Zmax 2 has band 12 out of the box, but no wi-fi calling of course.
[Windows Phone 8 General] papasurf:
Starting with another fresh L640, I skipped unlocking, went straight to debranding and flashing T-Mobile USA rom. I had success this time. Waiting for the unlock code :) From Pizzaboy's video I picked up on something. I could postpone unlocking the phone and de-brand and flash a T-Mobile rom . No SIM needed in the phone to do the work. I also used the short little USB cord that shipped instead of the longer ones I use to charge my phone. Every little thing seemed to help.

Thanks to anubis, thebosz and pizzaboy .
[Windows Phone 8 General] pizzaboy192:
Yup! I've flashed four 640's to T-Mobile before getting the unlock code. The phone's radio firmware isn't flashed, so it still retains the SIM lock from AT&T after the fact, but it allows me to get the phones set up with apps, accounts, etc before the unlock code comes in, and then all I need to do is throw in my SIM when the unlock comes in and it's golden. Glad I could help.
[Windows Phone 8 General] Peter.DD:
[MENTION=1170481]anubis23[/MENTION] Thanks a lot.

I have flashed my att 640 to Chinese rom(RM-1113, 059X1B5), It works well even I rollbacked it to 8.1 from wp10 preview by WDRT. Only one issue:

If I upgraded the Additional Info app from App Store, The detail info would change. Chinese rom has 10 items then only 5 items after upgraded with values changed (they are the same with ATT 's rom ), such as Frimware update notifier, messaging+ agent, SIM unlock, SpamFilter, etc.

With these change, some features also changed. The call history doesn't show the location(like ShangHai BeiJing) of the dialed number any more.

In my understanding, once I have flashed new rom by WDRT, there is nothing with ATT, I'm not sure why it rollback to original additional info if I upgrade the Additional Info app?

I have tried this many times, by WDRT, LumiaFlashTools, thor2, but...

Can you help check what's wrong here ?

Thanks in advance!
[Windows Phone 8 General] slimdam:
I hope someone can test it out and inform this thread.
[Windows Phone 8 General] ianvarivs:
Hi.

May I ask if someone has tried the:

RM-1073 - 059X0M9 - GLOBAL SWAP
[Windows Phone 8 General] trumpeter001:
Am I Missing the iutool?

I have everything together to start the process; however, I am still unsure about the iutool you refer to. I downloaded the tools from the link you provided, but I do not see the iutool in the mix. Please advise.
[Windows Phone 8 General] ombreman:
I flashed RM-1072 T-Mobile UK ROM on my AT&T Lumia 640. I can confirm that the LTE bands stay the same - no change. (LTE 2, 4, 5, 7, 12, 17, 28)
[Windows Phone 8 General] evilvoice:
Well, that was a bust. How can I fix an invalid platform id? I'm looking everywhere for information and it looks like I'm going to have to flash a hex file, mbn, vpl and a ffu to try and get my phone back. Can anyone help me?

WRDL downloaded all the files it downloads so I can go back to AT&T. I have a folder with tons of files, but no hex or mbn. I have bin files and vpl. I read that I can use bin2hex, but the one I downloaded doesn't seem to put it in the right format.

I have the gophone lumia 640 RM-1073 059X0B8.

Please help as this is my only phone and I need it for work tonight (I drive overnight).

Thanks
[Windows Phone 8 General] charlotted:
Indeed, the AR has WCDMA band 1,2,4,5 instead of band 2,5,8, and has many more FDD LTE bands than the MX version: 2,4,5,7,12,17,28 vs 1,3,7,20

With the T-Mobile US firmware, field test (dial ##3282#) shows in settings/manual/supported bands: WCDMA bands 1,2,4,5 and LTE band 2,4,5,7,12,17,28 so it's identical to the AR firmware.

Maybe the bands are software controlled for a same hardware model (RM-1073 for AT&T).

I wonder how possible it is to unlock all the bands by software, for like when you travel.

Specs from the microsoft.com links posted :

MX :

Red GSM: 850 MHz, 900 MHz, 1.800 MHz, 1.900 MHz

GSM, velocidad máxima de datos DL: EGPRS 296,0 kbps

GSM, velocidad máxima de datos UL: EGPRS 236,8 kbps

Red WCDMA: 2.100 MHz (banda 1), 850 MHz (banda 5), 900 MHz (banda 8)

WCDMA, velocidad máxima de datos DL: 42,2 Mbps (Cat 24)

WCDMA, velocidad máxima de datos UL: 5,76 Mbps (Cat 6)

Red LTE FDD: 2.100 MHz (banda 1), 1.800 MHz (banda 3), 2.600 MHz (banda 7), 900MHz (banda 8), 800MHz (banda 20)

LTE, velocidad máxima de datos DL: 150 Mbps (Cat 4)

LTE, velocidad máxima de datos UL: 50 Mbps (Cat 4)

AR:

Red GSM: 850 MHz, 900 MHz, 1.800 MHz, 1.900 MHz

GSM, velocidad máxima de datos DL: EGPRS 296,0 kbps

GSM, velocidad máxima de datos UL: EGPRS 236,8 kbps

Red WCDMA: Banda 1 (2.100 MHz), Banda 2 (1.900 MHz), Banda 4 (1700/2100 MHz), Banda 5 (850 MHz)

WCDMA, velocidad máxima de datos DL: 42,2 Mbps (Cat 24)

WCDMA, velocidad máxima de datos UL: 5,76 Mbps (Cat 6)

Red LTE FDD: Banda 2 (1.900 MHz), Banda 4 (1700/2100 MHz), Banda 5 (850MHz), Banda 7 (2.600 MHz), Banda 12 (700 MHz), Banda 17 (700MHz), Banda 28 (700 MHz)

LTE, velocidad máxima de datos DL: 150 Mbps (Cat 4)

LTE, velocidad máxima de datos UL: 50 Mbps (Cat 4)
[Windows Phone 8 General] Peter.DD:
When you extract the file you can get two folders "Blue_9651.12393_ProdSigned_OEM" and "BLUE_9651.12397_ProdSigned_WPTC", enter the first folder and run the "Setup.exe" to install the tool,then you can see the iutool under this path: "C:\Program Files (x86)\Windows Phone Kits\8.1\Tools\bin\i386" . Then you can follow anubis23's instruction. Be careful, good luck!
[Windows Phone 8 General] bahgelsson:
Wow! This is incredibly useful. Just followed the steps to a T, and I'm very happy to have my own Lumia 640 on T-Mobile's flash.

Thank you!
[Windows Phone 8 General] micallan_17:
I used the WPID tool to find the Platform ID and it shows as Nokia.MSM8926.P6122_ATT.1.1 I think the Nokia Lumia 830 RM-985 has the platform ID but without the ATT on it
[Windows Phone 8 General] trumpeter001:
Am I Missing the iutool?

Thanks. I didn't see it in the install options and just wanted to make sure.

---------- Post added at 06:32 AM ---------- Previous post was at 06:26 AM ----------

When unpacking the Cabs, am I supposed to leave the three cab files compressed? It appears so; however, it that is the case I must be doing something wrong. I keep getting this error.

ERROR: 0x80070490

Command failed. (HRESULT =0x80070490)

Any advice?

If it makes and difference, I am running Windows 10 64bit. I even tried running it from a Visual Studio CMD. All other components are installed and seem to be working properly.
[Windows Phone 8 General] PepperdotNet:
From what I've seen, the "SWPP" variants are for something other than productive use. Default image for a replacement board maybe. I don't know if I've ever seen one get updated past the initial version.

---------- Post added at 02:48 PM ---------- Previous post was at 02:42 PM ----------

Hey [MENTION=1170481]anubis23[/MENTION] and others,

Slightly off topic. I've got a Lumia 920 (RM-820) and need to change the product code. The thor2 ... -productcodeupdate fails on this particular model. In fact, the help text specifically calls out RM-820 as "out-scoped" which I think is technical for "doesn't work"

Any other tools you know of that can change the product code value?
[Windows Phone 8 General] evilvoice:
So, this is my problem and maybe someone can help.

I did every thing in the instructions all the way up to using WIPD to flash the ffu file. WIPD gave an error that the phone wasn't responding, so I tried a few more times making sure the phone was connected to the pc.

I then rebooted the device thinking I would just start over.

I got the blue sad face screen.

I loaded up the windows recovery tool and ran through it not detecting the phone. It would start to flash and give an error.

I checked the log and it complained about an invalid platform id

Can anyone help me on getting my device back?
[Windows Phone 8 General] adelmundo:
I had the same issue, but on Win 7 x64. I switched to a different machine (Win 10 x64) and it worked fine. I would try a different machine and see if it works.
[Windows Phone 8 General] evilvoice:
I've given up. I just don't know what else to do.
[Windows Phone 8 General] ianvarivs:
I've tried download it, but it doesn't work.

I need LTE Band 3 X_X

I already tried the unbranded Argentina one (059X227) but I still can't seem to receive the local LTE signal. I'm downloading the Mexican one (059X153) and see the results.

Or if anyone has a Singapore/Hongkong/Asia Pacific RM-1073 product code, I wish to try it too :)

-------------------------------

Over all, the guide DOES WORK.

I had a clumsy moment though. I removed the SIM card before the 3 cabs part, and I got lazy to put the cover back. After the cabs were pushed to the phone and the phone started its reboot sequence, I accidentally hit the phone and it went ala Spiderman across the tower (it was placed on top of the tower) and the BATTERY WAS REMOVED. Boy, I was like sweating all over X_X. Good thing the process continued right after I placed the battery.
[Windows Phone 8 General] PepperdotNet:
There are none, it's a regional (North, Latin America) device. No hardware to support what you're looking for.
[Windows Phone 8 General] ianvarivs:
Oh. Such sad news.

Anyway, I'll try to use the Mexican one when I get home.

If still not working, might as well go back to the original rom, though I have to search for a guide to restore the original platform id X_X
[Windows Phone 8 General] evilvoice:
All I can say is good luck. I've looked diligently for restoring platform id and couldn't find anything that would work. Then again, I can't get Thor2 to run from command line.
[Windows Phone 8 General] pile0g00:
It worked

Thanks for posting these instructions! My phone now has WiFi calling. I sent you a donation to further show my appreciation of the time you took to write this tutorial.

To others following these instructions. I did fumble with getting the ROM, but I suggest others use mrcrab.net/nokia.html(can't add full link, because forum says I am a noob) that others suggested and download the .ffu file. That site will give you the link and I used the link to start my download, but I don't know if that made any difference. I just used the link, because I wanted to see the source of the file I was downloading.