Trouble with Modem, Macbook Pro MD 101

Before i have my Macbook Pro i have a HP Laptop,

it can be connected to the internet by USB slot Modem

and a long time have passed

i bought a Macbook pro MD101 middle 2012

it was in Mavericks OSX version back then

and i use my old modem to that OS and it's work

after that i update my old mavericks to a Yosemite

and it's no longger working

it has an eror notice

please help me with my problem

Macbook Pro MD101 middle 2012

OS X Yosemite 10.10.2