Thank you!
I started to hunt a little deeper in the archive from your link and found this page:
https://web.archive.org/web/20110524181444/http://support.apple.com/kb/HT1998?viewlocale=en_US
I did not check the links, but it also contains other firmwares (and for A1034 is no newer version there) - so this might also be good for uploading.
