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A nearby agency is wanting their radios reprogrammed to reflect area communication changes. They have APX 4000 and 4500's ranging from first gen to current. Radios are used for P25 trunked, P25 conv, and analog operation. Firmware's are all over the place. Are there any reasons to NOT to upgrade the firmware to the current release version? They would like to take advantage of the Astro TPT feature which obviously is not useable with most of their current radios.