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Loading Firmware on the Device

The Junos OS 24.4R1 FIPS images only accept the firmware signed with ECDSA and rejects any firmware signed with RSA+SHA1. You cannot downgrade to images that are signed with RSA+SHA1 from "ECDSA signed only” images. In this scenario, the SRX Series Firewall device does not load the firmware. The load also fails if the embedded certificates in the firmware image are not valid.