@cythos The current Duet wiki is mostly still compatible with the 0.85, thought there is no hardware information on it. If you update to the last version of RRF for 0.85 (1.26.1, available here https://github.com/Duet3D/RepRapFirmware/releases/tag/2.05.1), this is largely the same as RRF 2.05.1, which the wiki covers in detail, usually in separate tabs if newer firmware versions have diverged. See https://docs.duet3d.com/
Ian