SOURCE: Upgrade firmware on a cisco ASA 5500 firewall
This is for the pixes, I haven't upgraded an asa yet...should be close or the same
* find latest version of code, these are usually *.bin files located on http://www.cisco.com/cgi-bin/tablebuild.pl/pix
* confirm the flash and RAM requirements of the PIX OS software versus what the PIX has (”sho ver”)
* make sure you have a backup of the old PIX OS and PDM to the tftp server (or at least confirm the software is there)
Note: You cannot back them up from the PIX, so you will need to download them and put them on the tftp server
* put in a change control form
* once change controls confirms date/time do the upgrade:
wri mem*** only if you save your configs via tftp
wri net
conf t
ca save all
copy tftp://your tftp server ip/pix635.bin flash:imageskip this if you don't use pdm
copy tftp://your tftp server ip/pdm-304.bin flash:pdm
*** if this is a failover pair, upgrade the other pair
reboot
SOURCE: Cisco ASA 5505 Firmware
Yes, it is possible and Yes you have to purchase it from Cisco.
Sorry, that is how they make the big bucks.
Consider a service contract on the unit, then you can download the firmware much cheaper.
SOURCE: Seems to have lost the existing firmware and will
you need to interupt the boot process, by using a console cable and interupt boot. Then do a serial download of a new image.
SOURCE: How to upgrade to SIP Firmware on Cisco 7945G
This process should work for you http://www.cisco.com/en/US/products/hw/phones/ps379/products_tech_note09186a0080094584.shtml
Cisco Telephone Power Brick
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