YOKOGAWA STARDOM FCN-500, Engineering Manual

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<2. Basic Design and Function Design>
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TI 34P02K35-02E Jun. 6, 2018-00
If you execute the plain “FcxRevup” command without the “-s" option, as is
usually done when performing a revision upgrade, configuration information
stored on the flash memory will be retained after command execution. This
may cause an error if the existing configuration information cannot be
interpreted by the older revision after system downgrade. Therefore, when
downgrading a system, execute the "FcxRevup” command with the “-s" option
to perform a clean upgrade along with initialization of configuration
information.
● Checking Service Packs and Service Releases
Service releases or service packs may have been published for some system
revisions.
For new system implementation, after installing the latest system revision, check
for the presence of published service releases and service packs, and apply them
as required. Similarly, after having upgraded or downgraded the revision of in-
house equipment to match the existing system, check whether any service
releases and service packs have been previously applied to the existing system,
and apply them accordingly to the in-house equipment.