Hi. sorry for my english. I succesfully downgraded my firmware from 1.10 to 1.02. You have to open the firmware file (1.02) with a Hexadecimal editor then edit the 10th byte (9h; 9; C0): change the value from 66 to 6E. Follow the instruction to upgrade the Dr-1. The recorder will see this new (but old) file as 1.10 and will let you downgrade your unity. Try it at your own risk This my two cents. (this is the best review about the dr-1 that i've ever read. Thanks Guitarfxr!) DrGonzo