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Ipsw downloader - download official ios firmware (ipsw) files for ipod touch 5, 4, 3, 2, 1 generations - ios 8.
I am not entirely sure that they are for the 1st generation ipod touch, but even if these two are not, i still may be able to obtain an ipsw for you.
Ipod touch 1g has been discontinued and it will not get any official update from apple. If you want look on list of features blackdoor custom ios firmware, click here.
The last available ios firmware for ipod touch 1g is iphoneos 3. Ipod touch 1g is quite fast with official firmware, but with whited00r 7 you will get a great boost and you will find lots of features that are available on only the most recent ios versions.