You have to change the product code of the phone to make sure that WDRT does not re-download and install the old ATT ROM, which would then undo what we just did. You need to run the code below to change the product code of the phone. Note: If you ever decide to use the WDRT to re-flash your phone. Now you have over written the DevicePlatformID in your phone and you can now de-brand your phone to any other Lumia 640 LTE ROM. At the end of the process your phone will restart to apply cabs and will show ‘migration’ screen.It will start downloading and installing the cab files on your phone.When your phone connected, execute the following comment on the already opened CMD iutool.exe -p C:\Lumia -V.Change the CMD path to cd C:\Program Files (x86)\Windows Phone Kits\8.1\Tools\bin\i386.Download and install the tools which contain iutool from here.Extract that Lumia cab files and move them to a folder in the root of your PC (ex: C:\Lumia\).Download the Nokia DataPackage Manager and Lumia Cabs file.WARNING : The process may brick your phone, we are not responsible if you break your phone. Windows device recovery tool installed with all required drivers.We found this tutorial on XDA and it seems to be interesting so we are sharing this with our readers. In this tutorial we help to De-Brand your AT&T Lumia 640 LTE. Hi everyone, we are here with a new awesome trick for Windows phone users.
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