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Seems they locked your topic on USB551l firmware update.
I do not know if this will help you, but I had much trouble. Finally found out the USB was locked into 4G, I have no 4G, only 3G.
I locked mine into 3G, them it worked just great. You will find instructions on this page.
http://www.proxicast.com/absolutefm/afmviewfaq.aspx?faqid=225
Hope this will help.