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active-passive firmware upgrade

Hi All, I wonder if you can help me. I' ve got two Fortigate 110C boxes running in an active-passive cluster. They are on the firmware 3.0 and I' d like to upgrade them to 4.0 MR3. I know that I can' t jump directly from 3.0 to 4.0 MR3 and will have to do it step by step, but I was wondering what is the best way to do it. Do I upgrade the master first and slave will automatically get upgraded? or do I have to break the cluster? And do it separately? How does the process look like? Thanks in advance! A
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apex

Thanks for the info, The plan takes place next week so I' ll let you know how did it go. Once again - thanks for your help! A
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