Cluster FTD Upgrade path

[hamidreza.taghipur]

hello

i have 2 FTD 4120 (cluster together)

i want to upgrade them ( FMC  and FTD )to 6.6.5 (stable version) but i dont know upgrade path for it

i should not have any timeout for this procedure

FTD version 6.2.3

FXOS version fxos-k9.2.4.1.222

FMC virtual  6.4.0.4

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my devices dont have access to internet

can you help me about

1-upgrade path for it

2-i dont know first i should upgrade FMC  or FTD or FXOS

3- which device first upgrade ?

[balaji.bandi]

First place read the release notes and understand the caveats any bigs which effect your environment :

https://www.cisco.com/c/en/us/td/docs/security/firepower/660/66x/relnotes/firepower-release-notes-66x/upgrade.html

Upgrade FMC first, make sure check the FMC

FXOS (if upgrade required)  and FTD.

Note : make sure keep the backup always out of the box

[hamidreza.taghipur]

do i check compatibility between fxos version  and firmware version  ?

thanks a lot