So just tried to upgrade my SDS100 to nxdn etc. on my.uniden.com account. During registration, SN was prompted for, ESN was not. The registered product displays SN only. ESN and Checksum fields are blank. Options for each modulation protocol are presented below with links "ESD required". Clicking on any prompts with entry fields for ESN and checksum. Having located these in the device settings, the ESN field only accomodates the first eleven of fourteen digits and cuts off the last three. The three character hexadecimal checksum is correctly entered. As above, the website tells me to go back because the checksum is bad. I believe my.uniden.com is calculating the compare checksum from the eleven digit cut off SN and is therefore obviously wrong. Replacing 260 charactets with Z still leaves one ESN character cut off. Why is Uniden limiting the length off the serial number, preventing this upgrade from succeeding? When I click on the customer support link, browser saysbit cannot find the server. Very frustrating experience.