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rooting help. FAILED (remote: unknown command) flashing issue.

You are entering

<ul style='margin-top:0; margin-bottom:0;'>
<li dir='ltr'><tt>fastboot boot recovery recovery.img </tt></li>
</ul>

[/LIST] When I think what you want is

<ul style='margin-top:0; margin-bottom:0;'>
<li dir='ltr'><tt>&#160;</tt><tt>fastboot</tt><tt> flash recovery </tt><tt>recovery.img</tt><tt> </tt></li>
</ul>

[/LIST]

@lunatic59 Both Yes &amp; No, they may want to:

fastboot boot recovery.img

so it'll just boot into the recovery and you can check to make sure it even works, which will also enable other options when booted.
The cmd:

fastboot flash recovery recovery.img

Will indeed install the recovery.img to recovery partition
 
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Just going off the op's post, which I assume was taken from the rooting instructions. ;)

Wrong version of fastboot perhaps, or wrong recovery image?
OP was just a case of extra cmd name when specifically using "boot" vs "flash" in fastboot cmd.. boot is directed at the file in question whereas flash wants a location to write file to
(how) -> (what) ->(file)
fastboot boot recovery.img

(how) > (what)>(where) -->(file)
fastboot flash recovery recovery.img
 
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