Recovery, in Android, refers to the bootable partition, in which the recovery console is installed.

It contains tools to help repair your installations as well as install official OS updates by using a combination of key presses or instructions from a command line sometimes.  

Android is open, meaning the recovery source code is available, so that building a customized ROM is relatively easy.

Method 1

1. Let's get started from turning off your phone.

2. Now boot into recovery mode by pressing and holding Volume Down and Power Button at the same time.

3. You can release all buttons when the LG L90 Dual D410 screen flickers and in a few seconds the Recovery screen will appear.

4. And this is it. Now you can navigate here using volume buttons and confirming your choice with power button.

Method 2

1. Please turn off your device and wait few seconds.

2. Next thing you have to do to get to recovery mode is pressing the Volume Down and Power Button at the same time for 2-3 seconds until the LG logo appears on the screen.

3. Then release the keys for a second and then press them again and hold untill recovery screen appears.

4. To navigate here use your volume keys and to choose use power button.