RPM upgrade is not a valid upgrade method to R81.20. RPM upgrade is a method of upgrading from R80.20.M1 to R80.20.M2 or later, but it is not supported for upgrading to R81.20. The valid upgrade methods to R81.20 are CPUSE upgrade, advanced upgrade, and upgrade with migration. References: [Check Point Security Expert R81 Installation and Upgrade Guide], page 12.
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