Hopefully someone here ran into the same problem: I'm trying to create an unattended LTI deployment using MDT 2010, but I'm having trouble skipping the Welcome Screen
SkipBDDWelcome=YES is present in both the CustomSettings.ini and the Bootstrap.ini. I have even regenerated the boot images but to no avail.
It's enough to set it in bootstrap.ini... after booting on your boot image, check the x:\deploy\scripts\boostrap.ini file (press F8 to get a command prompt).
If that file is different than your bootstrap.ini, delete the files in the boot folder, and update the deployment share again.
Don't forget to replace the boot image on your WDS server if you are using that