So I tried registering my POD HD500 today for the first time because I bought a new DT25. When I did, I got this error msg ESN could not be verified. Please confirm the supplied USN. ( Error: 523)" So I called line 6 and they told me that the chip inside the pedal board was never logged with Line 6 so the serial is no good. They asked me if I could return the pedal board. Guitar Center only accepts returns up to 30 days. I have had this pedal for over 2 months now. Then the support guy said my best bet was to sell it on craigslist. You've got to be kidding me? This is your ERROR Line 6!!!! NOT MINE!!! So now I cant update my POD HD500. Which by the way, this is my second POD HD500. I also own a KB37. UX2 POD farm 1 & 2, FX JUNKIE, Metal Shop, POD XT live (2 of them), Variax 600 (2 of them) a Variax 500, Pod X-3 Live, a DT25 Head, and now a POD HD500 I cannot update. Of all the products I own by Line 6 this is how I am treated??? This is BS! Someone needs to fix this!!!! Feel free to contact me in any way Line 6. Fix your mistake! I love my line 6 products please don't lollipop on me!