Recovery Mode is a feature that used to recovery the phone which can’t work.
To entering Recovery Mode, please power on the phone first, upon the phone display Initializing, press the OK hard key and hold on it until the screen show as following.
Then press and hold the numeric key as you need until you see the phone display another image.
Here is the operation video to help you know the basic operation.
http://fm.htek.com/rs/help/RecoveryMode.zip