The battery power level on a BlackBerry® device must be 50% or greater for the BlackBerry device to retrieve an update package over the wireless network. If the battery power level is below the minimum requirement, the update process suspends. The BlackBerry device prompts the user to recharge the battery and start the BlackBerry® Device Software update process again. If the battery power level returns to 50%, the BlackBerry device resumes retrieving the update package from the BlackBerry® Infrastructure.
The battery power requirement is designed to protect the BlackBerry device against attacks from a potentially malicious user who might try to take advantage of low battery power during a BlackBerry Device Software update.