Within an open codeplug using standalone APX CPS, POP25 is grayed out in the dropdown menu under Device > Communication Method.

Unable to schedule a POP25 programming read or write job.

APX CPS, Over the Air Programming.

The most common cause of this issue is the user does not have the ASK (Advanced System Key) loaded. The ASK must have OTAP POP25 enabled.

In order to access the POP25 communication method, including enabling POP25 under Trunking System>Features, and loading the Advanced Conventional Key before enabling POP25 under Conventional System>Features, the following additional requirements also apply as listed within the APX CPS help files for both conventional and trunking:

Conventional:

**Important note**:

For POP25 to be accomplished on an ASTRO System, an Advanced Conventional Key (ACK) or an Advanced System Key (ASK) with OTAP / POP25 access must be loaded in the CPS.

Accessed only:  

When the Secure Operation field is set to "Hardware", and when the System Type field is set to "ASTRO", and when a valid referenced Data Profile has been selected for the current conventional system, and when the radio is model / option capable.

Trunking:

**NOTE**

If you experience difficulties accessing a radio's IP address during a POP25 operation, depending on your system's firewall you may need to manually add the Motorola Solutions CPS as an exception to the firewall's exception list.

**Important note**:

This field has a view-only status when an Advanced (Hardware) Key without OTAP access enabled has been selected in the Trunking System, System ID field.

Accessed only:  

When the System Type field is set to "ASTRO 25", and when the current Trunking System has a referenced Data Profile, and (( when a Software System Key File or an Advanced System Key with access is selected in the System ID field) or ( an Advanced WACN Key with access is selected in the Home WACN ID field )), and when the radio is model / option capable.