I got some problems on my POD HD300 and just want to edit the tone setting thru USB. but I can't register the device. Line 6 says I should have a serial number with 17 digits XXXNLNNNNNNNNNN , while my device P3C0L622300012 only has 16 digits. And I failed to register it. It is funny , isn't it ? Line 6 sound is so great but I can't imagine how much time Line 6 has wasted us thru many many device problems/ issues.