Juniper SRX5800 Hardware Manual page 318

Powering On an AC-Powered SRX5600 Services Gateway
Powering On a DC-Powered SRX5600 Services Gateway
Powering On an AC-Powered SRX5800 Services Gateway on page 243
Powering On a DC-Powered SRX5800 Services Gateway on page 247
8. Perform the hardware upgrade on the secondary node by replacing SCB2 with SCB3, IOC2 with IOC3,
and the existing midplane with the enhanced midplane.
Following these steps while upgrading the SCB:
To upgrade the Routing Engine on the secondary node:
a. Before powering off the secondary node, copy the configuration information to a USB device.
b. Replace RE1 with RE2 and upgrade the Junos OS on RE2.
c. Upload the configuration to RE2 from the USB device.
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