@cbdvl Connect via USB - see https://duet3d.dozuki.com/Guide/1.)+Getting+Connected+to+your+Duet/7
Send M115 to get the current firmware version.
Recreate the SD card, see https://duet3d.dozuki.com/Wiki/SD_Card for specification, formatting and file structure.
Use the DWC version from the release that matches your firmware version (unless you update the firmware) - https://github.com/Duet3D/RepRapFirmware/releases
Use the RepRapFirmware Config Tool to recreate a set of configuration files - https://configtool.reprapfirmware.org/Start
Ian