Juniper Boot Sequence.

Hello,

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Soon i will be doing a Software Upgrade to my SRX Juniper Router. I want to configure the boot sequence so that if the newer version fails / doesnt boot, the older one boots second. On Cisco I am able to do that with typing the version i want it to boot with first and then the backup one second.

I tried to google how to do that on Juniper SRX, but couldnt find anything.

I have both .tgz files on my Router.

Could you please advise me on how to set up the boot sequence with Both Images on the Juniper?

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Thank you in advance!