I have a dellson navigation system for my honda civic 8th gen and till a few months back the navigation was working flawlessly till now when i open sygic maps on my dellson nav unit it says 'Sygic 11 expired'..When i change the date on my navigation system it works for a few moments then again says that 'product is expired'..Can anybody help me how can i solve this issue...Thanks in advance