I've red this

The configuration of the router will be lost

on http://wiki.mikrotik.com/wiki/Manual:Ro ... owngrading

Is it confirmed? I want to donwgrade from 6.7 to 6.7 as I'm guessing that new version cut some CCQ on several AP

It means dat your configuration that you made shall be lost by downgrade.
I have al manny downgrades done but never last the configuration.

Take backup from your configuration for secure your configuration en set back after the downgrade
if you need

http://www.wirelessinfo.be/index.php/mi ... /downgrade

Thanks!