I just flashed one of my N900s with the image for PR1.3.1 here:

http://nds2.fds-fire.nokia.com/fdp/i...ED_MR0_ARM.bin

Everything went well. This device, after flashing, is reporting a version of 21.2011.38-1.

Then I realized my other N900 is reporting a version of 21.2011.38-1.002.

I figured I would check to see if such a file exists, and sure enough, there is a file at http://nds2.fds-fire.nokia.com/fdp/i...ED_MR0_ARM.bin

I ran a diff, and the files are different.

Then I started trying higher version numbers, and there is a bunch of them. For example, at http://nds2.fds-fire.nokia.com/fdp/i...ED_MR0_ARM.bin

What is this? I have no idea. Did the Nokia engineers continue working on future updates behind Elop's infamous back? Could there be some goodies in there like Flash 11 and other insanity?

I have no idea. But if you decide to flash any of these, beware. I can confirm the first image seems to work because I just flashed my phone with it. As for the other ones, I don't even know what they are. It's interesting though.

It'll be interesting to mount these under nandsim and diff/binary diff/delta the entire filesystems.

I have a feeling that these are simply images with different regions, but the naming scheme is different from Harmattan ($SW_VER.xxx PR MR0 vs $SW_VER PR xxx)

Its just files for different regions/countries iirc...

Ah, that very well could be. My device with the .002 extension should be USA, and the one with no extension at all I just flashed with the global binary.

Wasn't it the patch for the bad DigiNotar certificate? http://talk.maemo.org/showthread.php?t=76178

Yes, you are right. I got confused because there are so many of those images (with 002, 003, 004, 005, 006, etc) appended to them. I guess it's just the regions. I was confused because I thought there was only 4 or 5 regions.