10-15-2016 04:34 PM
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  1. Fernando Cabrera's Avatar
    Try RM-824_lta_lta1_215 and CV as 000-CO
    I already could do it, and I have denim. But what I can not change the rom, on the subject explains that you can change the ROM 635 but not the 820, so far I can not go for FFU error.

    Sorry for my bad english.
    10-17-2015 06:56 PM
  2. sucusss's Avatar
    I manually flashed the T-Mobile ffu (059V6W5) - I made sure not to have any type of data or wifi connection so the update would not download until I performed the registry trick. Once I completed the registry trick (switched back to ATT-US and RM-975_1005), I checked for updates, and let it install. Upon rebooting the phone is still on T-Mobile firmware...
    So you originally have an ATT 635, and then converted it to a T-Mobile 635, and now you're trying to go back to ATT?
    Why are you trying to go back?
    10-18-2015 09:24 AM
  3. k7evolution's Avatar
    Hello!! We have the denim 8.10.15137.148
    I can do this tutorial with this Os ????
    10-23-2015 08:29 PM
  4. Mark F24's Avatar
    I have an AT&T GoPhone 635, I followed this procedure and it was a success. I upgraded to w10m 10536.1004. I wanted to upgrade to the next w10m release and to do so the phone must be restored to w8.1, Windows Device Recovery Tool reads device but fails when the flash starts.

    Reading through this thread I tried to go back to edit the registry as some suggested that changing to ATT US RM-975_1035 or 1005 may help, but at step 12 in the OP where you
    12) Scroll down under "Modding selected app", select "Select the XAP" >> Phone >> sd card >> Documents >> Select "CustomPFD_0003.xap" >> Apply XAP >> Wait till you see popup "Operation completed!...." >> Done >> Close app
    my phone fails. I cannot apply the XAP so if I remember correctly that is where the registry access is made. Any Ideas?
    10-24-2015 09:36 AM
  5. pankaj981's Avatar
    You will have to use Nokia Product Support Tool to flash back to the stock ROM. Before exploring that, check if Lumia Software Recovery works since it worked for one of our forum members.
    Mark F24 likes this.
    10-24-2015 02:58 PM
  6. phil2991's Avatar
    So you originally have an ATT 635, and then converted it to a T-Mobile 635, and now you're trying to go back to ATT?
    Why are you trying to go back?
    I am trying to go back because I would like to be able to use the Windows Device Recovery Tool again since I gave the phone to my son (just in case he ever needs a quick restore).
    10-26-2015 01:43 PM
  7. Fernando Cabrera's Avatar
    I already could do it, and I have denim. But what I can not change the rom, on the subject explains that you can change the ROM 635 but not the 820, so far I can not go for FFU error.

    Sorry for my bad english.
    Help
    10-29-2015 09:32 PM
  8. pankaj981's Avatar
    Help
    I apologize but I am having a hard time understanding the request.

    This is what I am assuming you are looking for...you have an AT&T branded Lumia 820 running the Cyan firmware that you wish to unbrand?
    11-02-2015 06:31 PM
  9. 5700xm's Avatar
    Hey everybody!

    Yesterday I tried to debrand my 640 LTE ATT GoPhone. (reset protection OFF)

    RM-1073_1044 -> RM-1072_1052
    ATT... -> 000-AT

    Unfortunatly it didn't work with that trick! (on the 635 it did)
    All steps in the procedure work except the last on: searching for updates...
    Phone respondes with "up to date".

    But I will continue watching this in the future. Maybe someone else got lucky on debranding the 640 and will share his knowledge/steps.

    By the way: I'm wondering if it would be possible to just turn off that ATT logo at bootup with this handy registry editor from the tutorial since the phone working properly here in Austria on all GSM-bands... (after unlocking). Uninstalling the ATT stuff manually isn't really a lot of work so I could live with that.
    Any ideas?

    Cheers
    Argentina CV ROM updated recently.
    Product Code : 059X227
    build 15184.36002 when at&t current is .36000
    11-03-2015 06:11 PM
  10. PepperdotNet's Avatar
    I have a final step to the original procedure. Only do this after you have done a successful unbrand. Use THOR2 (which is conveniently included with the Microsoft Device Recovery tool) to change the product code to match what you did in the registry. In the case of the NAM 4R CV 635 (which is the RM-975_1043 in the example) the product code is 059W4X2. Procedure below:
    [INFO]Navigate to the folder where thor2.exe exists i.e. C:\Program Files (x86)\Microsoft Care Suite\Windows Device Recovery Tool and run this command with the phone plugged to USB.
    thor2 -mode uefiflash -ffufile "[name of firmware file previously downloaded].ffu" -productcodeupdate 059W4X2 -skip_flash[/INFO]The -skip_flash flag prevents it from actually flashing the rom to the phone so you don't lose any data.

    What this accomplishes is that you can now use the WDRT and it will recognize the phone as the new product code in case you want to use that tool to recover it in the future.
    [NOTE]I have verified that this procedure works on RM-877*, RM-975 and RM-915, and doesn't on RM-820. Your mileage may vary.
    *the product code change, not the unbranding[/NOTE]One more really final step for completeness, plug the phone to Nokia Care Suite and print a replacement IMEI/product code/etc barcode sticker. I'll leave that to the diligent to discover.

    Thanks to anaheiim for pointing me in the right direction to discover how to do this.
    Last edited by PepperdotNet; 11-12-2015 at 02:23 PM.
    pankaj981, phil2991 and rhapdog like this.
    11-06-2015 02:32 PM
  11. PepperdotNet's Avatar
    So you originally have an ATT 635, and then converted it to a T-Mobile 635, and now you're trying to go back to ATT?
    Why are you trying to go back?
    I am trying to go back because I would like to be able to use the Windows Device Recovery Tool again since I gave the phone to my son (just in case he ever needs a quick restore).
    Alternative method for being able to use WDRT: see my post just above this one.
    11-06-2015 03:53 PM
  12. pankaj981's Avatar
    I have a final step to the original procedure. Only do this after....
    ....Thanks to anaheiim for pointing me in the right direction to discover how to do this.
    Great resource, thanks! I am adding it to the first post so its more useful.
    11-06-2015 07:09 PM
  13. Juan Rivero's Avatar
    Hi everyone. I have a question. I made the steps of the guide "Installing WP 8.1 Update 2 on Lumia Devices**" is there some problem if i do this process?
    11-09-2015 02:30 PM
  14. pankaj981's Avatar
    Hi everyone. I have a question. I made the steps of the guide "Installing WP 8.1 Update 2 on Lumia Devices**" is there some problem if i do this process?
    Nope there is absolutely no problem. You can do that process after the debranding, though debranding is optional for Update 2
    Juan Rivero likes this.
    11-09-2015 06:44 PM
  15. PepperdotNet's Avatar
    Hey, I just noticed that either the latest revision of WDRT changed the -skipflash to -skip_flash -- or more likely, I mistyped it when I wrote up the instructions.
    11-12-2015 02:24 PM
  16. phil2991's Avatar
    Thanks for this method! I was able to get WDRT to work using the tmobile firmware, but is there a way using the thor2 commandline tool to flash the AT&T firmware? It looks like it is still failing because it is doing some sort of check.

    Thanks!
    11-19-2015 09:23 PM
  17. clclarkbar's Avatar
    I'm debranded! Thanks so much for the guide. I'd also like to take part in the Windows 10 Insider Preview and may need the option to restore. I'm trying make the necessary changes so I can use WDRT like I have in the past, but what am I supposed to type for "[name of firmware file previously downloaded].ffu"? Thanks!

    Using ATT Lumia 635
    11-24-2015 10:59 AM
  18. PepperdotNet's Avatar
    The AT&T Lumia 640 GoPhone seems a no-go at this time. I have tried several valid combinations that should have invoked an upgrade, but the phone is always up to date. I even changed the firmware revision and OS revisions to a lower number. They must be checking something else instead of, or in addition to the model name and operator name.

    I did at least stumble across the setting that causes the AT&T logo and turned that off. HKLM\SYSTEM\Shell\OEM\BootScreens\WPBootScreenOverride
    Saijin_Naib likes this.
    11-28-2015 11:12 PM
  19. pankaj981's Avatar
    The AT&T Lumia 640 GoPhone seems a no-go at this time.
    Yep that's the first thing I tried after I got my 640. I guess I will wait till the WM10 ROMs start rolling out sometime next month.
    11-29-2015 06:08 PM
  20. PepperdotNet's Avatar
    Yep that's the first thing I tried after I got my 640. I guess I will wait till the WM10 ROMs start rolling out sometime next month.
    Problem is, a W10M release doesn't guarantee a newer firmware revision.
    11-29-2015 07:48 PM
  21. pankaj981's Avatar
    Problem is, a W10M release doesn't guarantee a newer firmware revision.
    Well it doesn't even guarantee that the registry trick will work on the newer WM10 firmware..until Microsoft release them I am just speculating
    11-29-2015 07:52 PM
  22. PepperdotNet's Avatar
    The main problem with the ATT 640 is that it's so new and for all practical purposes EOL. The only firmware newer than what comes on it are Tmobile and MetroPCS, neither of which are available OTA because they've never been updated since initial release, and probably never will be. Our only hope seems to be if one of the latin American variants ever gets an update at a higher version number.
    11-29-2015 11:55 PM
  23. pankaj981's Avatar
    Well Microsoft has been promoting the 640 as WM10 ready in the US. I don't see a reason why AT&T would not be provisioning the update for its variant. I guess time will tell.
    11-30-2015 01:36 PM
  24. FancyFreddy's Avatar
    Lets hope your right. AT&T is notorious for pushing updates well after the fact.

    I've still got my 3 cheapie 640s from the black friday BBuy sale.

    I found a 635 from T-mobile at a store marked down to $29 last august and its running the unbranded NAM firmware now. I'd like to get one of the EMEA ROMs loaded like I do with my dual sim LTE 640.
    pankaj981 likes this.
    12-05-2015 01:29 PM
  25. iamalone's Avatar
    Please, is this method aplicable to nokia lumia 1520?
    thank you
    12-23-2015 09:22 AM
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