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I tried nothing and my M550 printer name, but neither worked
You need to update your web interface to match the firmware you have.
Try uploading this one
https://github.com/Duet3D/RepRapFirmware/releases/download/3.2beta4/DuetWebControl-SD.zip
@shadowram As has been pointed out, the travel distances need to be set to at least what you have for your axes maxima. This will then allow homing for the worse case scenario where a gantry starts off as far away from an end stop as is possible,
