Now I don't have pc so I am posting this thread from my mobile.
1) You need to have root access
Now process :
1) Downland the pdf file attached below
2) Put this file to /data and give permission (rw-r--r--)
3)Now download Smanager from play store
4)Open Smanager and select browse as root then choose the script Select SU(bones) and then RUN
after that u will not see any changes
5)Now reboot your phone and go into recovery
factory reset wipe all data and format system
6)NOW Install alien 👽 rom. Let boot the rom and check storage and ya it's done........
Credits goes to KARKAND
AND PLEASE........................ HIT THANKS