Download Nxos.9.3.9.bin !!better!! [Updated — SUMMARY]
Upgrade the secondary switch first, then the primary. Wait for convergence between reloads.
boot nxos bootflash:nxos.9.3.9.bin show boot download nxos.9.3.9.bin
Copy the file to a FAT32-formatted USB drive, insert it into the switch’s USB port, then: Upgrade the secondary switch first, then the primary
Before diving into the download process, it’s important to understand what you are downloading. Cisco NX-OS 9.3.9 is a maintenance release that sits within the 9.3(x) family. This train is widely deployed on Nexus 3000, 3100, 3500, and 9000 series switches. Upgrade the secondary switch first