1. awaismshahzad's Avatar
    Hey guys! Before I start I just want to thank everyone who even reads this thread. Hopefully we can all benefit from this thread.

    Now onto my question. I have a Lumia 640 LTE that I bought prepaid from Newegg a couple months ago when they were very cheap. I wanted to get the developer preview but it wasn't compatible so I found Build 10240 here(forum.xda-developers.com/windows-phone-8/general/installed-leaked-windows-10-mobile-t3173000). Now I want to go back to Windows Phone 8.1 of T-Mobile but i'm not sure how.

    My questions is:
    1. How exactly do I get back to Lumia 640 LTE T-Mobile Windows Version 8.1? (I don't care what I have to install or how difficult it is...I just want to get back to the old version )
    2. Will I still get the OTA update whenever it will be coming?
    3. What is the product code (or where to find it) for Lumia 640 LTE T-Mobile so I can get the ROM on NaviFirm+ (which I have used in the past)?
    3. What is the product code (or where to find it) for Lumia 640 LTE T-Mobile so I can get the ROM on NaviFirm+ (which I have used in the past)?

    Thank you so much for any response or help,
    Shah
    11-28-2015 03:16 PM

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