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I would like to know the upgrade path for my NSA 5600 currently running 126.96.36.199-41n.
Kindly suggest me the upgrade path and latest stable version. And if any links how to perform this upgrade in HA mode.
You should follow the instructions in this KB article:
Pay particular attention to the dropdown that reads, Select your SonicOS Version. Make certain you chose the "SonicOS 6.2 and earlier" selection.