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611 Series Protection Relays Firmware Release 2.0.5

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This document is a release note for firmware update 2.0.5, applicable to ABB's 611 series protection relays (REF611, REM611, REB611, REU611). It details implemented usability improvements, communication enhancements (FTPS, PTP), cyber security fixes (CVE-2021-22283, TLS 1.2, Chrome compatibility), and supervision upgrades including RAM fault handling and self-recovery.

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