The SSU upgrade to 4.2008.36-5 went through and the N800 tablet still works. So I guess I should consider myself lucky.

But when I start Application Manager and check for updates, the SSU 4.2008.36-5 still shows up.

It's info page shows the following:

Status: Broken but updateable
Installed Version: 1:4.2008.36-5
Available Version: 1:4.2008.36-5
Download size: 0 kb

If I try to install the SSU again then after a few seconds I get the message that Application Manager was unable to install this update.

Does anybody know what is going on here?