For the Meizu M6 Note (codenamed "m1721"), the firmware files are usually distributed as an "update.zip" package. How to Update Meizu M6 Note Official Firmware
: The latest major global release, offering improved stability and SOS features Flyme 6.1.4.x meizu m6 note firmware
Transfer to Device: Place the file in the root directory of your phone’s internal storage (not inside any folder). For the Meizu M6 Note (codenamed "m1721"), the
Always backup your data and double-check your model number before hitting that flash button. meizu m6 note firmware
There are two methods: (easiest) and Bootloader/Fastboot Method (advanced).