Moved from SU.
First part at https://superuser.com/questions/975564/netbsd-and-tp-link-tl-wn727n-atheros-ar9271-or-ralink-rt5370
So, I've installed NetBSD 7 and device shown again as
ugen0 at uhub4 port 8 ugen0: Mediatek 802.11 n WLAN, rev 2.01/00, addr 2
Then I'm installed FreeBSD 10.2 and
usbconfig gives me
ugen4.3: <product 0x7601 vendor 0x148f> at usbus4, cfg=0 md=HOST spd=HIGH(480Mbps) pwr=ON (90ma)
So, what's next? Buying new dongle is a last thing, which I'll make.