I just checked on this and there's (as usual) a bit of an issue with adding software reset:
The wiz550io actually contains a little microcontroller than configures a MAC address that's set at the factory. If you software reset the w5500 then you lose that - but if you try and remember the MAC address from before then you might be remembering an invalid address and not actually resetting it properly.
So basically the only way to do it properly is to use the reset pin...
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