Default [Q] CEROS REVOLUTION with 21mbps Dongle?

Hi,
Has anyone tried using their CEROS REVOLUTION with a 21mbps Dongle, I have, used it successfully with a HAUWEI E1750 but, it will not recognize the HUAWEI E353 or the E3131 at all.
Yet both these 21mbps Dongles work great on my old Zenithink ZT280 C91 but the Zenithink is rooted so I was wondering if that could be the difference?
Any thoughts or experiences would be greatly appreciated.
By the way, I contacted CEROS about it and they said that they had tried it on the Tablets and it worked well.
They did send me the links to the firmware so that I could redo it but it made no difference...
Thank you
Regards granny1