iPhone 4 7.1.2 Disabled

Dear support sorry to open new thread coz all the thread about this problem are closed.I tried many settings but can not solve this.By the way this device is jailbroken and it has arabic language enabled as primary language.
Is this important in unlocking process?
Please help me it’s over a month this phone is in my shop.

By the way i searched the manual but can not find specific setting or order to solve this.