I downgrade a RB500 on my desk to the same version the remote system has and
then do the upgrade on my desk. So If upgrade kills my wireless-connection I have
to travel for the upgrade. If upgrade goes ok I can dare to do the remote upgrade.
wireless-crd doesn’t do anything for your router, it just changes some compliance mode. in later versions this package is not needed anymore. most important thing is - did your wireless connection stay active after the upgrade?