Android recovery is a bootable partition, which lets you apply official system updates from SD Card, factory reset your phone or wipe its cache partition.
How to enter Motorola DROID 2 recovery mode ?
Power off your device.
Boot in recovery mode by pressing and holding Volume Down and Power Button at the same time.
Release all buttons when the Motorola DROID 2 screen flickers and in a few seconds the Recovery screen will appear.
After the Android robot with triangle appears hold Volume Up and Volume Down simultaneously and recovery menu should appear