@ vu2pmc

Hope I understand the problem correct. So your zumo is working without a problem. You can enter Street, Adress etc. navigate with it but do not want to enter in USB mode when connected with USB cable to PC. Am I right? And this happen after you update to version 4.90? Before that no such problem. If so I don't think cure firmware is going to help. Of course you can try.

Cheers,