If you need to repartition the internal eMMC on a Nokia device (e.g., Nokia X, 3, 5, 6 series, or older Symbian/MeGoo devices), the “Nokia repartition tool” usually refers to one of these:
: Users can revert to the stock partition size (e.g., returning from 3.5GB to 2.5GB) by using official tools like the Nokia Restore Tool or flashing original firmware.
Most Nokia smartphones come with a partition layout set by the manufacturer. For example, the system partition might be allocated 3GB, and the userdata (where your apps and photos go) gets the rest.