In you decided to enter Recovery Mode, you have to turn your GROWING Phablet X6 off, so hold down Power Key for a few seconds to make it so.
Wait for a few seconds till your device completely turns off, and after that you have to hold down Power Key + Volume Up for about 5 seconds to proceed.
When you see Android robot appeared on screen, you should hold down Power Key and press Volume Up once to enter Recovery Mode.
When you're in Recovery Mode, you can navigate through the menu, using Volume Keys, and you can select options, using Power Button.
If you wish to quit this mode, you have to select option "reboot system now".