When attaching an XREF, I get the wrong block unit which I can't edit. How do I fix this? I'd like it to be in meters with factor 1. Thank you in advance!

[K.weijman]

[cadffm]

It is the right unit, or the one who saved the file used the wrong!

Open the file, measure a known length.

Is is drawn in meter or in inch?

If it is drawn in inch, the unit is correct..

You can change the unit of a dwg by command Unit or variable INSUNITS.

Exception: The unit is set to unitless(0), 

in this case and when you get unit inch in xref dialog, check your setting of INSUNITDEFSOURCE, set it to 0,

this way you earn unit unitless and unitscale 1

[K.weijman]

This worked for me, thank you!