Your first problem will be finding a suitable firmware version to flash, but this should help:
http://talk.maemo.org/showpost.php?p...00&postcount=1

Here is one suitable for UK although maps on EMMC would be out of date:
https://archive.org/details/RM696

As regards flashing this resource should help although links probably dead:http://wiki.maemo.org/Flashing_N9

Above article specifies the various Harmattan flashers dependent upon OS that you intend using, which should help you track appropriate version down, e.g. WinFlasher_3.12.1.exe

If device has not been re-housed product code should be underneath SIM holder or on small white label revealed when USB door open and SIM holder removed. Austria 16GB Cyan probably 059K0X8

For removing Nokia account prompts or activating Maps/Drive details can be found in this thread:
http://talk.maemo.org/showthread.php?t=95447