Bulk Erase supports the following Cisco phone models (without Administrative password set):
Any unsupported phones will have "Bulk ITL Erase not supported" warning.
Unsupported Phones when
Administrative Password is set
The following phone models cannot be supported when access to the phone menu 'Administration Settings' has been secured with a password. Please see 'Understanding Administrative Passwords '. This is a limitation of these Cisco phone models.
Supported Cisco CUCM server versions