Meizu has released a firmware for the Meizu M6 already, and here you have it for download on high speed mirror link. If you are planning to buy the Meizu M6, it’s good to have firmware downloaded so that you can repair it software-wise anytime you want whenever things go south.
We will also keep track of all Meizu M6 update stuff here, so it’s a good place to look for an OTA or latest software version for the device.
Using the Meizu M6 firmware, you can always go back to stock ROM on your device, abandoning any changes you made to device which may be causing it to lag or restart. Installing a firmware solves all such issues with the device.