Fortigate firewall migration

I have a legacy Fortigate model 400A want to be replaced by a 300C model. The existing 400A model is running a very old firmware v3.0, but the 300C is v5.0. Can you guys please give me some suggestion how to do the migrate? I'm not really familiar with forti products...

Many Thanks
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gcl_hkAsked:
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btanExec ConsultantCommented:
It is best to engage fortinet to guide the specific steps since this should be part of the maintenance and do have them advise the details - they have a portal for user like yourself (http://www.fortinet.com/migrating_to_a_fortigate_firewall.html)

In EE forum there is sharing that you may want to check out - the author also gotten it from the principal support
http://www.experts-exchange.com/Hardware/Networking_Hardware/Firewalls/Q_26929154.html

of course in their kb, ther have some in general like this - Technical Tip : How to load/convert a FortiGate configuration file from one unit to another (file conversion for a different model).
http://kb.fortinet.com/kb/microsites/search.do?cmd=displayKC&docType=kc&externalId=10063
Garry GlendownConsulting and Network/Security SpecialistCommented:
Judging from the age of the old box you have, I'd say starting clean should be an option to give some thoughts ... over the years, a lot of stuff piles up that isn't used anymore, or may even be a security threat ... by going over the old config, migrating piece by piece, you can ensure everything you move over is actually what it's supposed to be ... it may be worth the extra time invested to do it this way ...

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JinujozCommented:
1.Upgrade the Firmware of FGT 400A to v4 MR3 patch 18 ( follow theUpgrade Path)
2.Download the config after upgrade
3.Flash the firmware  of FGT 300C with v4 MR3 patch 18(downgrade from v5 to v4)
4.Review the interfaces in FGT 400C config &replace the same with mapped interfaces of FGT 300C on it
5.Post editing the config of 400A  ,copy paste the configuration into the CLI of FGT 300C(start copy past the content from"config system accprofile & neglect the content on top of it in the conf file).
6.Then go for upgrade to v5 on FGT 300C
gcl_hkAuthor Commented:
Finally, start from scratch...
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