PCM firmware version 4.05 is compatible with release 1.03 of the Model 331 CPU, IC693CPU331C, or later.
However, it is strongly recommended that all release 1.0x users upgrade to a later CPU release. This
upgrade is available at no charge. See “Additional Restrictions When Using a Release 1.0x CPU 331” later
in this document for a list of restrictions which apply only when a PCM is used with a release 1.05 or earlier
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