The khttpd does NOT support password use, so don't bother trying there. For kftpd, insert these lines into config.ini:

[hijack]
kftpd_password=MyP4SsW0rD

Connect up the serial port, and monitor the output while rebooting the player. You should see the above line get echoed out somewhere near the "end". If not, you screwed up.. fix it.

Once that part is working, just ftp to the player, use ANY userid (it is 100% ignored), and enter the password exactly as in config.ini.

-ml