Here are the Mikrotik branding packages for Mi6WAN. There are three versions, one for general devices on the network and one each for ether 2.397Ghz/5.9Ghz client radios. You just put each file on to your device and reboot. The client radio packages include default client configs so if you default/reset the device it loads a working config.
Mi6WAN 2.397 Client
Mi6WAN 5.9 Client