I have two City Aspire-2015 and 2016. Called Tracking World Karachi office today for updating maps. They gave me one Mobile Phone No: 03444476888 of Mr. Naveed Ajmal of Lahore Office. I called him and inquired about updating maps. His reply was to buy another card - RUBISH.
I tried myself to update on Naviextras.com by downloading Naviextras Toolbox. (Instructions on this web-sight are very helpful)
I succeeded updating my 2015 but the card of 2016 was not read by the Toolbox. I have lodged complaint with Naviextras by E-Mail which they entertained and asked me for few files from my SD Card to be zipped and sent on their E-Mail, which I did and awaiting their reply.