After purchasing my Retevis RA25 mobile radio the first thing i tried to do was program my radio by using the CHIRP Program software. To my surprise, the CHIRP program did not work because the radio I purchased wasn't registered in the Chirp program. I had to go online and download the Retevis software for my radio. I think the CHIRP program only recognizes only three or four radios offered by RETEVIS. If anyone has any questions about programming their radios, please let me know and I'll assist you the best I can. As a past Two Way Radio dealer for ICOM Radios, I do have somewhat knowledge of the programming of basic radio service.