After upgrading my Macbook Air to OS Yosemite it doesn't recognise the 3G USB modem which was working previously. Any ideas

After upgrading my Macbook Air to OS Yosemite it doesn't recognise the 3G USB modem which was working previously. Any ideas?

Hi ..
Reset the PRAM > About NVRAM and PRAM
Those instructions are for Mavericks but will work on Yosemite as well.
Then try the USB modem.

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