Nope, didn't work either.

Previous download was from http://fanoush.wz.cz/maemo/initfs_flasher.tgz, and the second one was from http://fanoush.webpark.cz/maemo/initfs_flasher.tgz. The second one had more files (leading me to believe that the first one may be corrupt; got "unexpected end of archive" message with it), but I tried both the boot guide and your suggestion, and I still got "not found".

Oddly enough, it's there in the Doc folder (as "initfs_flash" of course), but it's still not being found? I've assured that I'm typing it correctly, but who knows.