Hi,
To my knowledge there is no official tool for this but I have never really looked for one.
If you simply boot the device with the new software the ASA will automatically convert the old configurations but this might not be ideal. (Though I have little expirience on how the conversion goes as I dont use it myself)
If you want to risk the redudancy of the current network you could always remove the Standby firewall, boot it with new software and see how the configurations are converted. There will ofcourse be the problem on how you are going to confirm that the automatically converted configuration work. You might probably be looking at network downtime in any case.
If you have some NAT configurations that you need the new format configurations for I could try to help you there. Give you some samply configurations that you could then apply to rewrite the configurations.
Also "packet-tracer" is an excellent tool to test the NAT and ACL rules on the ASA itself before and after upgrade of software.
- Jouni
