Someone has posted a template to do so somewhere in Thwack(not sure where it is), and the Beta release 2 version of the NCM product includes the ability to upgrade ASA firmware. Your company needs to be willing to run Beta software, mine does not.
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Hi, I just uploaded a Cisco ASA 5512 Base Context Mode- Internal over VPN .xml' in THWACK.
Check it out on the content exchange area on thwack >>>> Network Configuration Manager