I'm really sorry that i'm writing in english, i don't speak or read in France, but it looks like your forum is my last hope

I ended deleting the Win10 from my iWork8, i have about 16GB unused free space on the drive and i want to resize the android partition adding it the unused space with Gparted Live.
the problem is, that the access to android_data partition via Gparted is blocked. error:
Do you have any ideas how to solve this?
tnx!
BTW, the android OS is working (not rooted)