Instructions for unlocking
If you are unsure of your skills,entrust this work to professionals.
Diassembly your tablet.
Find resistors responsible for boarder_id.Remove them,you will turn off the modem and change identity of your iPad.
I-On the Model A1454 remove the resistor r1204 and make jumper on place of r1205.
On the Model A1455 remove the resistor r1204,r1205 and make jumper on place of r1205.
II-Tablet will enter DFU mode.
III-Connect the tablet to your PC or Mac.
IV-After that you need to restore the tablet throught iTunes with firmware of Wi-Fi model and activate using the official method.
V-Turn off the automatic firmware update: Settings/iTunes/Store,App Store/Automatic download/Updates.
This instruction is not suitable for iPad Wi-Fi
All thanks to Pasha4ur