This file is used by the 'Synchronize Control Head with Radio' feature in the ASTRO 25 Mobile CPS. Please extract and then copy to this folder : C:\Program Files\Motorola\ASTRO 25 Products\ASTRO 25 Mobile CPS\Upgrade WARNING: Please do NOT use this tool to update XTL1500 radios. Revision number: Astro_25_CH_BR Part Number: RVN4185, RVN4186 Product Applicability: ASTRO 25 Mobile Radios with R20.50.09 firmware