While impressive, it is mostly a "proof of concept" today. Do not expect modern Android 13 or 14; you will likely be looking at legacy versions of Android. 3. Maemo Leste
The Nokia N9 still has a lot to offer, and custom ROMs can help you unlock its full potential. Be sure to explore the options listed above and find the one that best suits your needs. Remember to follow the installation instructions carefully and take necessary precautions to protect your data. nokia n9 custom rom link
Do you have a specific (Android vs. Linux) you are leaning toward for your N9? While impressive, it is mostly a "proof of concept" today