According to following document ISSU upgrade is supported from NX-OS release 7.3(3)D1(1) to release 8.2(3)
ISSU Paths for Cisco NX-OS Release 8.2(3)
I wanted to know if ISSD is supported from release 8.2(3) back to release 7.3(3)D1(1)?
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From the same document that you linked it says the following:
Non-disruptive in-service software downgrades (ISSD) are not supported in the Cisco NX-OS 8.x releases.
So I'm afraid it is not supported.
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