Yaesu has made it clear that if CHIRP screws up your radio, your warranty is void.I have had bad luck with Chirp and Yaesu radios. Buy the RT systems software and their cable. Yes, it's a bit pricey, but it will absolutely work. I've had Chirp flail with an FT-70 and mess up the memory banks. Chirp is fine with Baofeng etc. but not real radios.