I had this problem for 3 days i went berserk over it then finally found a cure so here it is 
Have 4.2.1 with 5.15.04 baseband want to jailbreak a 3g phone but get the usb communication problem message well here is the awaited solution in attachment first you will need to download your ispw restore when u load the attached program click browse find your ispw then load iff u have a problem with your baseband u will need to click ipad baseband and untick cydia if fnot just click next and hey presto it will work

Have 4.2.1 with 5.15.04 baseband want to jailbreak a 3g phone but get the usb communication problem message well here is the awaited solution in attachment first you will need to download your ispw restore when u load the attached program click browse find your ispw then load iff u have a problem with your baseband u will need to click ipad baseband and untick cydia if fnot just click next and hey presto it will work

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