We have already got €16 held by Carl Mai and "imlost" from the other forum (or another name here) is interested plus, maybe pietu too so you could actually scrape enough together guys?
Nesting can be a problem as each map MUST be in its own folder in the root of the device
"cannot use this map blah blah" usually means the map isn't activated. Check to see if there is (as needed) a meta.dct file in the map folder.
If you're referring to the 945 Android map please confirm, step by step, where from & how you downloaded/installed this