In my yesterday's thread, I am thinking whether buying a N900 now or wait for the next Nokia N9XX with Maemo 6 OS.

I thinked about this deeply last night and I found one point.
This is the key point and a very big difference between Nokia Maemo device and Android device/Apple iPhone.

That is :
Both iPhone and Android phone can upgrade their OS.
(iPhone can upgrade from OS 1.0 to 2.0, then to 3.0
Android can upgrade OS version from 1.5 to 2.1)

But N900 cannot.
Also, all NOKIA phones cannot upgrade OS.
(I mean cross-version upgrade, not just the bug fixing upgrade)

It's just like on my PC, I can use Ubuntu 8.04.3.
I can also install 8.10 or 9.04 or 9.10.
When 10.04 release on Apr.2010,
of course, I can install it on my PC.

But it seems that NOKIA's "rule" is to make the mobile phone and OS a bundle.
For instance, you cannot install Maemo 5 on N810.
and it seems Maemo 6 cannot run properly on N900.

I think this "NOKIA rule" may be OK with some S40 low-end (entry level) mobile phones.
But for smart phone market, this action should not be taken.

So I am wondering whether NOKIA could provide a CD image
or some thing like that to let the end user install the OS by ourselves, just like what Apple does.

I think NOKIA should think about this question.