Download the old assistant with 5.02 firmware, remove the assistant you have installed at the moment then install the old assistant. Hook up your WKM in the usual way and when it checks for new firmware you will see the "upgrade" is now actualy a downgrade. Don't forget to default all settings in assistant and reconfigure.
I've had a slight yaw to the left I can't get rid of, higher temps on both motors and esc's, plus it's no where as stable on altitude or attitude hold and I just can't get good repeatable performance from flight to flight.
I'm sick of it, so it's time to roll back.