[chirp_users] FT-857D with extended transmit

Hi friends,

I am signing up for USAF MARS today, and I've made the extended transmit range modification to my Yaesu FT-857D. Now CHIRP no longer works with the radio, reporting an error message about an unexpected value in the first block. (I apologize for not having copied the exact error message -- I can get that if it would be helpful.)

Has anybody achieved success using CHIRP with a MARS-modded FT-857D? If so, what is the trick to this?

David ​ / K7DB