How to open pattern, password or pin on android and hide photos without any app

How to open pattern,password or pin on android allmost all devices 

1. Firstly you need to backup your all data on your sd card.

2. Then power off your device.

3. Then press and hold the volume key+power key.

Note: -touch is not working at that time

4. Now go to the factory reset with the help of volume key. (Press down key for going down side). 

5. Then for ok you need to press power key. 

6. Then after go in yes option with the help of volume key and press ok with the help of power button..and your device will automatically restart..... Enjoy

If you got any problem in this process,tell me in comment box. I will try to solve these problems