By browsing the linksys ftp site, I found a directory containing all open source firmware availablle, and there is also the one for 300N.

Maybe this was implicit in the fact that third party firmware does exist, but i just wanted to make sure.
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= Taym =
MK2a #040103216 * 100Gb *All/Colors* Radio * 3.0a11 * Hijack = taympeg