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During the transition of Nokia’s Devices & Services division to Microsoft, a need arose for a consumer-friendly tool to "unbrick" devices or reset them to factory defaults when the on-device recovery options failed. NSRT serves this purpose by downloading the appropriate Operating System (OS) image from Microsoft’s servers and flashing it onto the device via a USB connection. Unlike the "Windows Device Recovery Tool" (which eventually superseded it), NSRT was specifically branded for Nokia heritage devices.
Compared to earlier 5.x versions, v6.2.55 improved: Nokia Software Recovery Tool 6.2.55
NSRT is built on the .NET Framework (likely .NET 4.5 or 4.6) and acts as a wrapper for lower-level command-line tools used internally by Microsoft engineering. During the transition of Nokia’s Devices & Services
Version 6.2.55 is significant as it bridges the gap between the older "Lumia Software Recovery Tool" and the newer "Windows Device Recovery Tool." Compared to earlier 5