Hi everyone, I really need your help. I have a meizu M6 with a Flyme 6.2.0.4G version firmware. The problem are :1. I updated the firmware to 7.0.1.0G.The result is :
a. SD Card blank
b. I can root the device

2. I downgraded the firmware to 6.2.0.4G. The result is :
a. SD Card detected and fine
b. I can't root the device
I've tried to use Kingroot, Framaroot, the android and pc software like Kingoroot and Genius but it failed.

I bought an sd card to increase the storage and move the app to sd card. But, it's complicated.