Macbook cannot detect D-Link DWM-156(A7) USB modem after upgrading to OS X Yosemite ver 10.10

Hi
My MacBook Pro 13" is unable to detect D-Link DWM-156(A7) USB modem once I open the D-Link Connection Manager app (to connect to the internet) even though the USB is plugged in.
The MacBook is able to detect the USB at first, but once after I open the D-Link Connection Manger, it can no longer detect the USB Modem and a notification which says "No USB Modem Connected" pops up.
This problem only surfaced after I upgraded the Macbook to OS X Yosemite ver 10.10. I tried to solve the problem by restarting the Mac but the same problem still arise.
What do i do?
Thanks in advance.
Regards

I figured it out!
I had the same problem with the dongle sent to me by Telkom South Africa.
Mine was D-Link Model: DWM-157. Here's how I fixed it.
I basically flashed or updated the firmware on the dongle to the latest one I got from the D-Link website.
1. You need access to a PC (Windows computer).
2. Go to: http://www.dlink.com/uk/en/support/product/dwm-157-3g-hspa-plus-usb-adapter
3. Scroll down and download firmware version 4.5.4.7
4. Once download is complete, move over to your windows PC. Plug in the D-Link USB dongle.
5. Run the firmware update on the Windows PC while the USB Dongle is plugged, Follow the prompts, it takes a little while, sometimes it seems like it is stuck but be patient. Once its done it will ask you to press any key to continue.
6. After the install, pull out the dongle and plug it back in, sometimes the device installation prompt will appear. If so, rerun the device installation again. Wait for all the drivers to install. If not open d-link connection manager on your windows PC and test if it is able to make a connection to the internet. If the test was successful go to #7 below.
7. Go to your Mac. Uninstall the current D-Link connection manager your have.
8. Plug the USB Dongle back, the installation prompt will pop up again.
9. Go through the installation steps and a prompt will pop up asking you to restart, restart your machine.
10. Run D-Link connection manager and you can now get to the connection screen. Wait a while for network to be found.
11. Click connect.
12. Come back here and tell us if this worked for you. It certainly worked for me.

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