How to unlock/reset android lockscreen pattern or pin

There are two Ways to reset your forgotten password or pattern

Bypass or reset lock screen pattern without loosing data:

By signing in with your google account:

When you set a pattern you will be prompted to set a backup pin so that you can unlock the device with that pin when you forget the pattern.If you forget the backup pin too then the simplest way of resetting the pattern is by signing into your google account.Follow the below steps to reset patteren.

• If you observe closely you will find an option called "forgot pattern". Click on forgot pattern.
• You will be able to see two options.One is to enter the backup pin or enter your email id and password.
• If  you lost your backup pin then enter your email id and password to unlock the device.Email id with which you have registered your device is already displayed there,you need to enter password of that id and hit enter or ok.
• If your login credentials match to that registered on device then you will be redirected to settings so that you can set a new pattern or pin or password.
• This will even work if you are not connected to network as google saves your id and password on device itself ,though encrypted.

Bypass lockscreen pattern by  Formatting:

If you haven't set  any google account on your device then the only way to unlock is by formatting your phone .If you adopt this method you will loose all your data on your phone.So try this method only if you are brave enough to loose your entire data like images,contacts,apps etc.
1.Force shutdown the phone by holding the power button for 15 seconds
2.Enter bootloader mode by holding power button and volume keys simultaneously
3.Once you enter the bootloader release the keys.
4,Bootloader depends on  type of deice you are using.so if you are using
a.Nexus device you can enter bootloader by pressing all the keys simultaneous
b.If you are using a Samsung device hold the power button along with volume up button and central navigation button(home key) .

c.If you are using Lg device pressing Power button and volume keys simultaneously will take you to bootloader
d.If you are using Motorola device holding volume up and power button will let you enter bootloader
5.Once you are in bootloader moder press volume up or down and you will see list of options
6.Select Factory reset by navigating with volume keys and press power button once you are on factory reset option.
Note: Use volume up button to select on Motorola Devices as pressing the power button will just restart the device.
7.Once done select reboot option
8.Once the phone reboots you will be able to use it as usual but you will be missing all your data