Make sure PC can ping (or contact) ASA.
Install tftpd-hpa (defaults work fine, but conf is /etc/default/tftpd-hpa)
Run it:
/usr/sbin/in.tftpd --listen --user tftp --address 0.0.0.0:69 --secure /var/lib/tftpboot
Copy files to /var/lib/tftpboot directory (asa831-k8.bin, adsm-631.bin etc)
Add IP of ASA to iptables.conf and run it to let traffic from the ASA through.
Example IP tables line:
$IPTABLES -A INPUT -s 192.168.1.1 -j ACCEPT
Optionally test by installing tftp and tftp localhost.
On ASA:
enter IP, source and destination file name and wait for copy
repeat for second file (IOS or ASDM)
optional verify:
To install, go to global configure:
adsm image disk0:/adsm<version>
boot system disk0:/asa<version>
copy run start
reload
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