just copy the key then right click in the DOS box and select 'Paste'
It turns out it isn't quite that simple. You need to edit the properties of the DOS box in the header border.
However, even pasted the Beta key doesn't work
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just copy the key then right click in the DOS box and select 'Paste'
An alternative plan of attack would be to follow this guide which will give you root & a custom recovery (Clockworkmod 2.5.0.7 which still works well for the Desire).
There is an easier way to get root but it won't give you s-off. But many of us managed without s-off for quite some time. What do you hope to get out of rooting? I presume it's more storage. You can have that without s-off but you'll need to partition your sd.
If you follow the guide linked in the above quote you will find that you've most of the steps already.
Do you not have the hboot drivers already, from trying revolutionary? Should be the same ones, because the revolutionary guide tells you to use the download link from the unrevoked guide.
I'm unsure why it's so complicated. As you'll have gathered, most of us found that one or other tool worked pretty much straight off (I had to run unrevoked twice, after the first attempt failed with some error, but the second was fine).
Can I just ask precisely what hboot version and android software version you currently have? Just to be sure of compatibility.
Ok, your hboot is fine, but 2.2.2 is probably not going to work with unrevoked. The thread title for that is "2.2.1 or lower", and we'll have done that for a reason. Unrevoked is an old tool, and hasn't been updated for the latest software because the developers moved on to revolutionary. So I suspect it's got to be revolutionary now.
Ah, that may explain it.
Unfortunately using Revolutionary returns to the original problem where I couldn't get the Beta key to be recognised