iPod Touch 1G Background not changeable?

[laznz1]

Sry I didn't recognized that this was an english forum^^ (stupid...I know)
So I try to translate:
I can't changed the background of my iPod Touch (Lock-Screen), that means, I am able to go to Settings and set a new Background, but when I press "Save", there is no change! The same Background again and again....I'm getting very dizzy.....
My iPod is:
- 1G
-on firmware 2.2.1
-jailbreaked
-previously backuped (no change....problem still remains)
Can someone help me with my problem?
BTW: If someone could tell me how I get Summerboard or Customize on firmware 2.2.1 it would help a lot.....I would try to change background with those apps!

[Europa]

Winterboard replaced Summerboard a long time ago.

You can use Winterboard to change the Spring board background (background behind the icons), but if you just want to change the lock screen background, go to Settings > Wallpaper > Wallpaper/Camera Roll/Photo Lilbrary > Choose an image > Set. If that doesn't work try disabling the current theme you have with Winterboard. If your theme doesn't show up in Winterboard, back it up and then delete it with a program that allows root access to the phone. You can use iPhoneBrowser for PC or Diskaid for Mac (wired) or set up SSH (wirelessly).