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No. The Nokia RM 750 flash file does not change network locks. The SIM lock is stored in a separate NVRAM partition.

In this guide, we will explain exactly what a flash file is, where to find a genuine Nokia RM 750 flash file, how to use it with flashing tools, and how to troubleshoot common errors. A flash file (also known as firmware, ROM, or stock ROM) is the low-level software that controls your phone’s hardware. For the Nokia RM 750, this file contains the Windows Phone 8.1 or Windows 10 Mobile operating system, drivers, boot loaders, and system partitions.

Yes, but you need the specific Windows 10 Mobile FFU for RM-750. Note that performance on 512MB RAM (Nokia 520) will be poor.