Asus has the most complicated way to get in Droidboot and Recovery i ever saw in a phone.
The correct instruction:
Enter Droidboot: Phone must be turned off first. Press only power button and after 2 seconds, still holding power button, press the volume up releasing the power button when the phone vibrates while still holding the volume up for 5 seconds. Now enter droidboot.
Recovery directly without go through droidboot: Phone must be turned off first. Press power button and volume down, when vibrates release the power button while still holding the volume down for 5 seconds. Now you see the android logo with belly up. Do not freak out seeing the no command exclamation. Now press volume up and power and quickly release both but volume up first. Now you are in recovery.