Motorola MC21XX SERIES User Manual page 25

Getting Started 1 - 9
Improper Shutdown Message
Figure 1-9
If the MC21XX stops responding, first perform a warm boot. A warm boot maintains radio status and registry
settings. Do not perform a cold boot unless necessary.
Performing a cold boot resets the MC21XX to factory defaults and loss of all registry settings.
To perform a warm boot, press and hold the Power button for five seconds.