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615 Series Protection Relay Firmware Update 5.1.20 Release Notes

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This document details firmware update release 5.1.20 for ABB's 615 series protection relays (REF615, REM615, RET615, etc.), including critical cyber security fixes for CVE-2021-22283 and improvements to self-supervision, protection functions, and communication. It also references the previous release 5.1.19, which addressed Ripple20 vulnerabilities, time counter rollover issues, and GOOSE/IEEE 1588 communication enhancements.

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