Hello bryan_washburn, You can look at the release notes and it will tell you how to upgrade the node firmware.  Here is the release notes for 10.3.5 & the instructions are listed in the notes. [URL]
I am relatively new to performing OneFS code and firmware updates. I have reviewed the various support docs and I am able to successfully install OneFS Code Upgrades, Roll UP Patchs (RUPs), Healthcheck patches, and Drive Firmware. However, I am having trouble finding or figuring out the correct process for installing Node Firmware. While I believe I am reviewing the correct support docs, I think I am now confusing myself with the various isi upgrade cluster and patches commands. Isilon Gen 6 running OneFS 8.2.2 I have reviewed the following.Dell EMC PowerScale:Non-Disruptive Upgrade Best Practices - Aug 2020OneFS 8.2.2 CLI Reference and the Administration Guide I suspect that I am missing something obvious or making it more difficult than it really is.At this point, I would greatly appreciate a high level start-to-finish process and commands   Thank you,Bryan
Isilon Node Firmware Updates