My friend's Dualshock 4 controller won't sync to my PS4 [duplicate]

I'm doing some stuff with my mate's controller, but it won't even sync to my PS4. I did all the tricks and even bought a new sync cable, but nothing seems to work. Can anyone help me with this issue?

Try the following:

1. Turn on your PS4
2. Connect the DualShock 4 controller to your PS4 using the USB cable
3. Press the PS button on the DualShock 4 and wait for the controller to connect
4. Unplug the DualShock 4 controller and it should be synced with the PS4

Failing that, try the DualShock 4 reset button:

Turn off the PlayStation 4. Locate the small reset button on the back of the DualShock 4 near the L2 shoulder button. Use a small, unfolded paper-clip or something similar (but not a pin) to push the button (the button is inside a tiny hole). Hold the button down for a couple of seconds and release. Then follow the above steps again.