@oldschoolPiratename Flashing the 0.85 is the same as current boards, ie use Bossa. I've never got Sam-ba to work. See https://docs.duet3d.com/User_manual/RepRapFirmware/Updating_firmware
Use the 'RepRapFirmware.bin' file from https://github.com/Duet3D/RepRapFirmware/releases/tag/2.05.1 which will update the board to 1.26.1. Duet 0.6/0.85 can't run RRF 2.x.
Ian