Is there a map for Nigeria (West Africa) in SYNC 3.4 and can I change my region from NA to West Africa during the update

Unless you update to Sync 3.3 or 3.4 via reformat, you will not be able to update the maps to West Africa from North America. You must reformat the APIM to change regions, and you will need to make several APIM asbuilt changes with the proper programming tool and OBD2 adapter. This is similar to replacing NA maps with ROW-NNG maps. This tutorial will show you the general things that need to be done.

Tutorial: Installation of ROW (NNG) Maps on NA 32GB Sync 3 APIM - Ford / Guides & Info - CyanLabs Official Community