My Imac late 2012 running Yosemite does not recognise my Huawei 3g usb modem. itried to install Java bt still it does not although the same modem works with my MacBook pro . any help please

My Imac late 2012 running Yosemite does not recognise my Huawei 3g usb modem. itried to install Java bt still it does not although the same modem works with my MacBook pro . any help please

Hey there mbarikiwa,
If your iMac still has not recognized the usb modem, I would use the troubleshooting for Yosemite USB issues in the following article:
OS X Yosemite: If a USB device isn’t working
If the device is connected to a USB hub: 
Make sure the device and the hub are the same speed. Connect USB 3.0 SuperSpeed devices to a USB 3.0 SuperSpeed HUB, USB 2.0 Hi-Speed devices to a USB 2.0 Hi-Speed hub, and so on. 
If the device doesn’t have a power cord and is plugged into another USB device that doesn’t have a power cord: 
Try plugging the device directly into your computer’s USB port  or into a USB device that does have a power cord. You might need to disconnect and reconnect the other device as well, if it has stopped responding. 
If you have many devices connected to your Mac: 
Disconnect all USB devices except the device you’re testing, an Apple keyboard, and an Apple mouse. Make sure that the device is connected directly to the computer, and that any hubs or extension cables are disconnected. If you can use the device now, the problem may be with one of the other USB devices or hubs you had connected to your computer. Try reconnecting them, one by one, to your computer. When you find the device causing the problem, review its documentation for further troubleshooting steps. 
Verify that the device appears in System Information: 
Choose Apple menu > About This Mac. In the window that appears, click Overview, then click the System Report button to open System Information. 
In the window that appears, see if the USB device is listed below Hardware in the Contents list. If the device appears but does not work, review the device’s documentation for further troubleshooting steps. 
Restart apps: 
Quit and restart any apps that use the device. 
Restart your Mac: 
Choose Apple menu > Restart.
Check your device’s USB connection
Thank you for using Apple Support Communities.
All the very best,
Sterling

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