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Brocade does not support upgrading from more than two previous releases, for example,
upgrading from Fabric OS v5.1.x to v5.3.x is supported but upgrading from Fabric OS v5.0.x
or a previous release directly to v5.3.x is not.
Upgrading a switch from Fabric OS v5.0.x or a previous release to v5.3.0 requires a two-step
process: first upgrade to v5.1.x or v5.2.x and then upgrade to v5.3.0. In addition, prior to
upgrading to v5.3.0 Device-based routing must not be in use, otherwise the upgrade will fail.
Upgrading to Fabric OS v6.0.0 is only allowed from Fabric OS v5.3.x.
FOS / SAS version requirements for FA4-18 and AP7600: