Software Installation and Upgrade
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Base OS update (ACX710, EX Series, MX Series, NFX Series, PTX Series, QFX Series, SRX1500, SRX4100, SRX4200, SRX4600, SRX5400, SRX5600, SRX5800, and vSRX3.0)—Starting in Junos OS Release 24.2R1, Junos OS uses the FreeBSD main base OS. This upgrade provides improved security and better performance. In earlier releases, Junos OS used the FreeBSD Release 12 base OS.