My phone is root but I cant edit system files help!!

I trid to root my phone with ( kingo root ) and after that I trid to delet some unnecessary apps but I faild .
It said ( this is read only file system )

After that I trid terminal commands , mount to rw , un root , root again
but all faild

So I dont know what should I do ?

Can this p8 repair again??

Help me

Huawie p8 GRA-UL00
Androd 5.0.1
C433B180
Middle East rom

from xda-developers http://ift.tt/2aIMav6
via IFTTT