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REX640 Protection Relay Firmware Update Release 1.2.1
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This document announces firmware update release 1.2.1 for ABB REX640 protection relays and LHMIs, applicable to units delivered before February 3, 2022, with Product Connectivity Level 3 (PCL3) and firmware version 1.2. The update includes cyber security fixes (notably CVE-2021-22283 for MMS file transfer vulnerability), supervision improvements for PKI certificate renewal, User Account Management enhancements, and HMI/WHMI stability and language fallback improvements.
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