The firmware for the M3 Note comes in a "Scatter File" format (a text file telling the tool where to write data in the phone's memory).
The Meizu M3 Note runs on Android 5.1/6.0 base (Flyme 5/6). Many modern apps (WhatsApp, banking apps) are dropping support for this OS version. Flashing new firmware will not upgrade the Android kernel. meizu m3 note firmware sp flash tool
Consider installing a custom ROM (LineageOS 14.1/15.1) via SP Flash Tool – these are scatter-based custom ROMs that update security patches. However, performance remains limited to 3GB RAM max. The firmware for the M3 Note comes in
If your M3 Note is stuck in a bootloop that won't go away even after flashing the ROM, the internal storage partitions might be corrupted. meizu m3 note firmware sp flash tool