If anyone wants to know, I queried TT's service dep't about the MARS mod on Monday 2/15 and got a reply on Wednesday 2/17. They sent me a file that I update the radio with, and that generates a text file I email back to them, and then they send me a file to update with again and it's done. IIUC. 73, Brian AAR5HS/KA9EGW