IPod touh cannot be restored, not eligable for requested build

A very common error, I know the ins and outs of it because I searched it up like crazy.
I have an iPod Touch 4G, 1 year old that is stuck at 4.2.1 firmware, and despite it is the exact same model as is being sold in the shop right now, it seems it is being treated like redundant tech left behind in the dust.
Anyhow, literally everyone ever who has had this issue, and they rectified it by modifying the Hosts folder like this following handy guide recomends
http://www.karthikk.net/2011/06/how-to-solve-this-device-isnt-eligible-for-the-r equested-build-error-ios-5/
However, despite this seems to work for everyone, it hasn't worked for me. For a start, most guides *** to modify the following line from
#74.208.105.171 gs.apple.com
to
# 74.208.105.171 gs.apple.com (only difference being a space)
But in mine, that never existed to begin with, and strangely enough, all my hosts are Adobe. So as another guide suggested, I added the line myself, both with and without the space, and followed the guides perfectly, but with no success.
Can someone explain to me what on earth is going wrong here?
All I want to do is restore my iPod and start a clean slate, then probably upgrade to iOS5.
Thanks in advance, though I do not expect any help to arrive.

- See if this helps. It is Microsoft's article for resetting the hosts file.
3194-How do I reset the hosts file back to the default?

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