Recovering primary JUNOS image

When I booted my SRX device I saw the following output on the console;

This had not happened before. According to junos documentation I can either install a new junos image to be on the safe side or copy the backup partition to the primary. As you can see my current partition is backup. Once I snapshot the backup to active partition and then
reboot after a while, I could boot from the primary one.

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