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    Thread Recover Nokia Lumia 800 without Navifirm?

    Hi, I have falshed my Nokia Lumia 800 with a custom 7.8 Rom. Now I would like to reset it to the factory default OS. How can I do that without NaviFirm? I guess I need the following file: Nokia 800 RM-801 o2 Germany DE Black_Postpaid_V5 That's the file, the Nokia Product Support Tool For Store...