Here is resource upon Delight Belle CFW: https://n8delight.blogspot.co.uk/p/change-logs.html
To help you further what firmware version is your N8 running, type in *#0000# on dialler? It must be early software version if Nokia Maps v3.03 installed (thought it was 3.04 initially on N8) as uses Map Data from 00.01.29.100 series whereas Nokia Maps v3.09 uses data from 00.02.54.223 series; there is more detail available within latter so incompatible with former.
If device is running Symbian Belle it would have Nokia Maps v3.09 12wk20 b01 installed and you should still be able to download new maps via WiFi connection (not applicable 00.01.29.100 anymore), although this feature within Nokia Suite now defunct.
You can however still download further map data for 00.01.29.100 and install it manually from here:
http://web.archive.org/web/20170410161531/http://mp107.xaa.pl/nokia_maps_v_00.01.29.100.html using workaround described:http://answers.microsoft.com/en-us/mobiledevices/forum/mdlumia/newest-nokia-ovi-maps-0125114-manual-download/7f0e8253-ea9b-4d64-9005-a7538dca468c
Let me know if you want any further assistance.