I purchased and installed nex 5100 in last 10 days. Purchased from amazon. Yesterday I upgraded firmware from 1.01 to 1.05. 

Today , while updating maps - it threw error "License Error". Not sure why . These are maps legally downloaded from neviextras toolbox. My unit is hardly 10 to 12 days old. 

I reformatted usb drive couple of times and did map update process from scratch with no luck but the same "license error" all the time. 

Though , I sent email to Pioneer support, I am checking here if anyone has an idea on this or have gone though same situation. 

Please let me know. Thanks in advance. 

Haven't had any map update error myself

Please keep us informed on what happens if no one else here provides a resolution.

Well, I received response from Pioneer and they advised me to upgrade firmware one more time. Sometimes a firmware upgrade won't go through , even if the unit says it did. 

I (re)updated firmware with latest (1.05) firmware and then updated maps successfully. 

Thanks for the update update. 

I have the same problem and I just reupdated the firmware to 1.05 again. Still a license error. Any tips?