10-15-2016 04:34 PM
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  1. pankaj981's Avatar

    Description

    This guide will show you how to de-brand your branded AT&T device. At the end of this tutorial your phone will receive updates directly from Microsoft and no longer wait for AT&T to release them.



    Warning

    1) All changes made to your phone are pseudo-permanent, pseudo being I haven't tried reverting back to the AT&T firmware, never want to :)

    2) This process does need some ROM flashing skills via Nokia Product Support Tool so please proceed with caution (used only if you want to flash another firmware)

    3) I would not be taking responsibility if you accidentally brick your phone so please ask questions before proceeding


    Software Requirements

    ​1) AT&T Nokia Lumia 635 or 820 running OS version 8.10.14219. If you are on a lower version please check for updates from AT&T or update using Preview for Developers

    2) Start with a clean software, i.e. reset your phone before proceeding (make sure Preview for Developers is not installed)

    3) Files Needed (download link) ** I do not own these files. They were linked from this thread **


    • SDK 8.1 Lite.zip (*** install this after download ***

    • CustomPFD_0003.xap

    • CustomWPSystem_0500.xap



    Hardware Requirements

    1) AT&T Nokia Lumia 635 or 820

    2) microSD card

    3) USB cable


    Process: Part 1 - Preparation

    1) Hard reset phone using hardware key combination (Reference)

    2) Go through setup process, update all system and preloaded apps

    3) Storage Sense >> phone >> apps+games >> select all >> uninstall all apps

    4) Storage Sense >> Store new apps on my "phone"

    5) Connect phone to PC using USB

    6) PC >> Start Menu >> Programs >> Windows Phone Developer Registration >> Register >> Enter MS Account >> Done >> Close

    7) PC >> Start Menu >> Programs >> Windows Phone Application Deployment 8.1 >> Target = Device; App = "pathoffile\CustomWPSystem_0500.xap" >> Open >> Deploy >> Deploying File >> App deployment complete. >> Close

    8) Verify if CustomWPSystem shows up in app list

    9) PC >> Explorer >> My Computer >> Select Phone >> SD Card >> Documents >> Move CustomPFD_0003.xap here >> Done

    9) Storage Sense >> Store new apps on my "SD Card" >> Done

    10) Store >> Download Preview for Developers >> Let it install >> Don't open after install >> Pin to Start >> Done

    11) Open CustomWPSystem >> Click on red bar "SD Card permissions" >> Select "sd card" >> Press "done" (check mark below) >> red bar turns green

    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


    Process: Part 2 - Registry Edits

    1) Open previously pinned Preview for Developers app >> HKLM >> SYSTEM >> Platform >> DeviceTargetInfo

    2) Edit Registry:

    For Lumia 635: (AT&T Nokia Lumia 635 >> Nokia Lumia 635 US Country Variant Denim ROM)
    PhoneMobileOperatorName >> 000-US >> Write
    PhoneManufacturerModelName >> RM-975_1043 >> Write

    For Lumia 820: (AT&T Nokia Lumia 820 >> Nokia Lumia 820 LTA MX CV Cyan ROM as of 06/02/2015)
    ** I haven't tried this personally so proceed with extra caution **
    PhoneMobileOperatorName >> 000-22 >> Write
    PhoneManufacturerModelName >> RM-824_lta_lta1_223 >> Write

    3) Check for Updates >> Install Updates >> Phone is now unbranded

    ​** If you want to update to WP 8.1 Update 2 then proceed to this link else continue **

    4) Reset using "Part 1 - Preparation: step 1)

    5) Start using phone


    Observations

    1) Denim firmware enables graphic equalizer on the 635

    2) Phone can now be flashed to other non-AT&T RM-975s but not AT&T ROM

    3) ** Windows Phone Recovery Tool and Lumia Recovery Tool cannot restore to AT&T firmware **. Use Nokia Product Support Tool to flash other firmware.

    ** Or use the method posted below to re-flash the ROM **

    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.

    Note

    1) Please thank the OP, grozaman for posting this method here

    2) This method was used de-brand the AT&T Nokia Lumia 830 RM-983 to the RM-985 variant but it did not work (details). Thanks RumoredNow for volunteering for the experiment!

    3) Please thank PepperdotNet for posting about how to reflash the unbranded ROM back to the device


    Last edited by pankaj981; 03-03-2016 at 10:59 AM.
    06-02-2015 10:52 PM
  2. advant's Avatar
    grozaman and pankaj981, Thanks a bunch for this procedure. I followed the steps exactly as described and was successfully able to debrand my ATT Lumia 635.
    pankaj981 likes this.
    06-03-2015 08:37 AM
  3. UNIX based's Avatar
    How long is the Windows Developer Registration suppose to take mines stuck on Trying to detect a windows phone connect to the computer
    Last edited by UNIX based; 06-03-2015 at 06:09 PM.
    06-03-2015 10:06 AM
  4. UNIX based's Avatar
    Forget what i said right here lol
    Last edited by UNIX based; 06-03-2015 at 06:09 PM.
    pankaj981 likes this.
    06-03-2015 10:44 AM
  5. Li_meme_ca's Avatar
    I updated my Lumia 635 using Preview for Developers and could only get version 8.10.12400.899. How can I get 8.10.14219? Before this I was stuck at 8.10.10xxx.
    06-04-2015 02:52 AM
  6. pankaj981's Avatar
    I updated my Lumia 635 using Preview for Developers and could only get version 8.10.12400.899. How can I get 8.10.14219? Before this I was stuck at 8.10.10xxx.
    Check your preview for developers, it might have unenrolled you after the update. Enroll again and check for updates. It should take you to 14219 eventually
    06-04-2015 07:46 AM
  7. UNIX based's Avatar
    I was having the same problem were it wont update because of an error. factory reset fixed that problem
    pankaj981 likes this.
    06-04-2015 08:46 AM
  8. Elitewolf's Avatar
    thanks for this i'll try it one day.
    06-04-2015 04:10 PM
  9. Don Geronimo's Avatar
    If my 635 is still carrier locked to AT&T, will it be possible to carrier unlock the phone after the debranding, or will I have to unlock it first?
    06-04-2015 05:14 PM
  10. youngsailor's Avatar
    thank you. this works in my 820. But now it is only in "cyan". To get a "denim" shall I flash it with another firmware? if so, which one would you recommend?
    06-04-2015 06:21 PM
  11. UNIX based's Avatar
    thank you. this works in my 820. But now it is only in "cyan". To get a "denim" shall I flash it with another firmware? if so, which one would you recommend?
    Uncheck developer preview in the app.
    06-04-2015 06:33 PM
  12. Li_meme_ca's Avatar
    Check your preview for developers, it might have unenrolled you after the update. Enroll again and check for updates. It should take you to 14219 eventually
    Thanks. It worked but only after I did a factory reset. Before the reset, it could not check for updates. "error 80072f8f".

    Now I am on update 14219 and am ready to debrand my Lumia 635. My device is unlocked; will it stay unlocked after bebranding? I believe it will but better make sure!
    Also, sorry if it's a stupid request but I am not clear about step 7 and step 1 of part 2. Could someone expand it so I know what to see/do when I have started the process. I am sure most people on this forum understand what you mean but I am a noob....
    Last edited by Li_meme_ca; 06-04-2015 at 07:11 PM.
    06-04-2015 06:56 PM
  13. pankaj981's Avatar
    Now I am on update 14219 and am ready to debrand my Lumia 635. My device is unlocked; will it stay unlocked after bebranding? I believe it will but better make sure!
    If my 635 is still carrier locked to AT&T, will it be possible to carrier unlock the phone after the debranding, or will I have to unlock it first?
    Yes, unlocking is tied to IMEI and not the firmware...you may loose warranty though so please read carefully to avoid a situation

    thank you. this works in my 820. But now it is only in "cyan". To get a "denim" shall I flash it with another firmware? if so, which one would you recommend?
    If you are on AT&T then please read the guide, mind you the solution is untried on the AT&T 820 so please proceed with caution. If you are not on AT&T then post additional details about your phone, it might be actually easier otherwise

    Also, sorry if it's a stupid request but I am not clear about step 7. Could someone expand it so I know what to see/do when I have started the process. I am sure most people on this forum understand what you mean but I am a noob....
    See software requirement, Step 3). I would suggest doing this only if you are comfortable enough in fiddling with your phone ROM and registry (this can be dangerous) which looks like you aren't
    xandros9 and TechFreak1 like this.
    06-04-2015 07:08 PM
  14. Li_meme_ca's Avatar
    I would suggest doing this only if you are comfortable enough in fiddling with your phone ROM and registry (this can be dangerous) which looks like you aren't
    Agreed. Thanks for the warning.

    I won't proceed until I see the steps in a video. Anyone kind enough to upload a video if you are performing this? Thanks.
    pankaj981 likes this.
    06-04-2015 08:50 PM
  15. rhapdog's Avatar
    I'd really love to try this with my AT&T 635. How much time would you estimate this will take from start to finish? Would I be able to pull this off within 4 hours time or less, total, with all the resets?

    Also, if I want to "rebrand" AND update to WP 8.1 Update 2, do I have to completely repeat all the steps again, starting with the reset after de-branding? Or while I'm at that point, can I edit the registry in Part 2 of the Update 2 instructions and then reset?

    If I do the re-brand AND the update to GDR2, then how much time should I set aside for me to get it all finished? 2 hours? 4 hours? more?
    06-04-2015 09:12 PM
  16. pankaj981's Avatar
    Well from start to finish on a freshly reset'd device takes less then 20 minutes to debrand and about 20 mins to install Update 2. Majority of the time is taken by the backup step so depending on how much data your phone has to backup during the update will really decide the total time.
    Laura Knotek and djeire84 like this.
    06-04-2015 09:24 PM
  17. Li_meme_ca's Avatar
    I'd really love to try this with my AT&T 635. How much time would you estimate this will take from start to finish? Would I be able to pull this off within 4 hours time or less, total, with all the resets?
    Please make a video as you go along....for the noobs
    06-04-2015 09:36 PM
  18. youngsailor's Avatar
    Uncheck developer preview in the app.
    It doesn't help. I guess non rm-824 has denim update yet.
    06-05-2015 01:07 AM
  19. youngsailor's Avatar
    If you are on AT&T then please read the guide, mind you the solution is untried on the AT&T 820 so please proceed with caution. If you are not on AT&T then post additional details about your phone, it might be actually easier otherwise
    yes, mine is from ATT. your method works. but there is no new update on this debranded channel as well. also I tried to reset the phone and it returned back to ATT.
    06-05-2015 01:22 AM
  20. djeire84's Avatar
    I went from Vodafone Ireland to Three ireland and now I'm totally debranded lol. Its great now I can get direct updates and such instead of waiting on any one mobile carrier to release them. Its,great the only downside is you have to wait two days initially to get the phone IMEI unlocked but after that its plain sailing. I have gotten update 2 also by debranding.
    06-05-2015 01:35 AM
  21. djeire84's Avatar
    I'd really love to try this with my AT&T 635. How much time would you estimate this will take from start to finish? Would I be able to pull this off within 4 hours time or less, total, with all the resets?

    Also, if I want to "rebrand" AND update to WP 8.1 Update 2, do I have to completely repeat all the steps again, starting with the reset after de-branding? Or while I'm at that point, can I edit the registry in Part 2 of the Update 2 instructions and then reset?

    If I do the re-brand AND the update to GDR2, then how much time should I set aside for me to get it all finished? 2 hours? 4 hours? more?


    Yes do try if you can. Its only in around an hour (for me that is) as you have to install all apps and such between resets. But yes its great. My Nokia Lumia 520 is dare I say it much better then even day one if purchase (two years ago). GDR2 rocks by the way its much much better!!
    06-05-2015 01:38 AM
  22. rhapdog's Avatar
    Please make a video as you go along....for the noobs
    That sounds like something I would absolutely love to do! But... the only method I currently have of making a video is to use my L635 for recording it. Seeing as how it will be reset a couple of times during the process, and that the camera on the L635 can't see itself, I'm afraid I won't be able to do this. I won't have access to any other camera or smartphone during the process either, unfortunately. My wife used to have a nice camera with good quality HD recording, but, alas, she dropped it and it wasn't repairable. She decided not to buy another, because she uses her phone now, which is sub-par quality.

    I went from Vodafone Ireland to Three ireland and now I'm totally debranded lol. Its great now I can get direct updates and such instead of waiting on any one mobile carrier to release them. Its,great the only downside is you have to wait two days initially to get the phone IMEI unlocked but after that its plain sailing. I have gotten update 2 also by debranding.
    Will there be a problem waiting to IMEI unlock AFTER the de-branding? I don't plan on changing carriers at all, just want to control my own updates. My understanding is that it should not be an issue if I never IMEI unlock, but would there be an issue if I decided to try to unlock it later? While I've flashed phones, I've never carrier unlocked one before, believe it or not, because I've never changed carriers. Doesn't mean I won't, but I just haven't so far.
    06-05-2015 05:49 AM
  23. djeire84's Avatar
    That sounds like something I would absolutely love to do! But... the only method I currently have of making a video is to use my L635 for recording it. Seeing as how it will be reset a couple of times during the process, and that the camera on the L635 can't see itself, I'm afraid I won't be able to do this. I won't have access to any other camera or smartphone during the process either, unfortunately. My wife used to have a nice camera with good quality HD recording, but, alas, she dropped it and it wasn't repairable. She decided not to buy another, because she uses her phone now, which is sub-par quality.





    Will there be a problem waiting to IMEI unlock AFTER the de-branding? I don't plan on changing carriers at all, just want to control my own updates. My understanding is that it should not be an issue if I never IMEI unlock, but would there be an issue if I decided to try to unlock it later? While I've flashed phones, I've never carrier unlocked one before, believe it or not, because I've never changed carriers. Doesn't mean I won't, but I just haven't so far.

    Carrier unlock is good if you decide to change down the track. All you have to do is contact your carrier and they will send you via Nokia care a long unlock code within two days (for me) and the email will have step by step instructions on how to do it. Its how you will be able to get updates directly instead of waiting in your carrier to send them out.
    06-05-2015 06:02 AM
  24. rhapdog's Avatar
    Ah, so I need the carrier unlock to get updates directly? I was hoping the de-branding would do that. Okay, so I need to unlock, debrand, and update to Update 2. Better request an unlock code now. The only window of opportunity I will have to do the debrand and update 2 will be tomorrow during a 6 hour window, then not again for 3 or 4 weeks. Hopefully I can unlock after without issue.

    I want to make sure I'm ready for that Windows 10 upgrade later without having to wait for AT&T to release it. ;)

    EDIT: Unlock has been requested from Carrier. Must wait 2 business days. Grr.
    06-05-2015 06:12 AM
  25. djeire84's Avatar
    Ah, so I need the carrier unlock to get updates directly? I was hoping the de-branding would do that. Okay, so I need to unlock, debrand, and update to Update 2. Better request an unlock code now. The only window of opportunity I will have to do the debrand and update 2 will be tomorrow during a 6 hour window, then not again for 3 or 4 weeks. Hopefully I can unlock after without issue.

    I want to make sure I'm ready for that Windows 10 upgrade later without having to wait for AT&T to release it. ;)

    EDIT: Unlock has been requested from Carrier. Must wait 2 business days. Grr.

    You see debranding is like redecorating an already existing room, IMEI unlocking is like knocking the room piling it on a truck and rebuilding and decorating it on the moon.
    06-05-2015 06:48 AM
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