If you need to convert back from 5.7/6.x into the 5.0/5.3/5.4 vector format, use v.out.ogr (to SHAPE format) and then v.in.shape in the old GRASS program. Alternatively use "v.out.ascii -o" and v.in.ascii.
As this GRASS version uses SQL for attribute management, there are some SQL restrictings concerning the file names.
Missing centroids can be added with v.category.
v.convert in=vectormap_from_50 out=vectormap_60
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