Disassembled an N900, put it in the oven at 190 degrees Celsius for five minutes, removed all plastic parts and camera.

I can CONFIRM that reballing with hot air in my oven has made it able to call again, after years! I had written it off.

After trying this to fix an old macbook pro, reading on threads about it being able to fix the ati radeon graphics card, I tried it as a last resort.
It worked. I was stunned. And gained confidence.

And now my 'dead' first N900 has been brought to life again.
Made sure to put it on aluminium tinfoil balls to keep it from burning on the grill.

https://youtu.be/Ztzv2OlQJuU

I would prefer doing it with a heat gun in the future tho, localize the heat..

Warning reminder : plastic melts!!

Edit: updated video with the correct one