i got this file magic:sys in the application manager when i check for updates but it dose not update ?? it says it is "all system packages" ??and 0 kb ??
just wanted to know what is wrong

thanks everyone

you likely already have all system packages installed

Isn't there a problem if you try to update magic.sys while in red pill mode?

Yes there it is... It can brick your device

I nearly had to reflash because of this magic:sys.
I had some repositories which had newer system packages than the nokia-repository. Some files got overwritten and the device didn't boot. Luckily I had a ssh-server installed and it got started. I then made a ssh-connection, cleaned the /etc/apt/sources.list from non nokia repositories and did an downgrade via "apt-get upgrade". After rebooting all worked like it should.

Now I use apt-pinning to preserve systemfiles from getting overwritten:
http://wiki.debian.org/AptPinning

Can anybody explain what the red-pill-mode exactly does with apt?

I already have a part of an answer to the red-pill-mode:
The application-manager is a frontend for apt which preserves apt from updating system-files. The red-pill mode disables this function and the app-manager just works as a - as I think bad - gui for apt-get.
For me the best solution would be to install aptitude because I prefer to work on the console via ssh, for upgrading and installing software. It is so incredibly faster then the app-manager.

So has anybody an experience on installing aptitude?

Apt-get is automatically there after you run xterm, if that's what you mean.

i wanted to install aptitude some time ago but did not know how so i just forgot about it