There is no driver for this in the 4.4.x Linux kernel.
I found very useful info here, with a link to driver source:
I downloaded the driver from here:
Note, another site is here:
After installing the kernel source PET, I compiled it on my laptop, running Xerus64. Haven't tested it though, only ran "ifconfig -a" to verify that the wlan1 interface exists.
I don't have the correct source for the 4.4.19-v7+ kernel used in my Pi build, so cannot yet compile on the Pi.
Comments:Mediatek MT7610U wifi adaptor Posted on 17 Sep 2016, 19:33 by admin
I also have one of these. Same thing, not supported by the kernel.
Awhile back, I compiled the driver, so I know it works.
Source is here, follow link to MT7610U USB:
Not sure what to do about this lack of wifi adaptor support in the kernel. I'm using a pre-compiled 4.4.19-v7+ kernel, but to add these extra drivers, I am going to need the full source for the Pi, and the .config.