In the "Update PCB from schematic" tool in version 7, IIRC you just have
to *not* select "Re-link footprints to schematic symbols based on their
reference designators". If that doesn't work, you can also go around
all the components on the PCB manually giving each one the correct
designation, and then update the PCB with that box *selected*. I know
the latter works, because I partially did this last week (for completely
different reasons).
Regards,
Robert
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