Thanks in advance!
yes, you can bring the first fiirewall up to the final version before you start work on the second
As long as you only upgrade to the next major version I would recommend it the way you describe.
For example if you planned to go from 7.0.2 up to 8.0.10, then you should upgrade both firewalls to 7.1.x before you do the next step to 8.0.x.
Thank you both.
After upgrading the Primary firewall and make it functional again, will it not prompt about the mismatch of the IOS version on the peers in HA. Will The HA work? Will it allow me to suspend the secondary from the HA pair so that primary which will run on new version can take over?
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