Firstly you are running either Symbian S^3 Anna, Belle or Belle Refresh depending upon age of device. Try entering *#0000# upon dialler to elicit result. What is the seven character alphanumeric product code for your E7-00?
Try using this software and see if it can update device: http://microsoft-care-tools.s3.amazonaws.com/NSRT/NokiaSoftwareRecoveryToolInstaller-8.1.25.exe
You will have to install any maps of which 2015 is newest available manually from here: http://nokiamaps.prv.pl/nokia_maps_voices_v_00.02.54.223.html
Ironically Nokia Maps links are still viable at time of writing.
Please post agin if you run into any difficulties or want any further advice.