@stormi Thank you so much. Only now getting around to setting up another set of R660s, will let you know how this works.

Edit: worked beautifully on a new set of R660s. Using the old 20250606 ISO, the BCM57414 were not detected. The new ISO works as expected (BIOS install, did not attempt UEFI) and the NICs are all enumerated properly.

@olivierlambert Thanks so much for the quick response and for looping in the Team-OS-Platform-Release folks — I really appreciate it.

I’d be more than happy to test an updated installer ISO if one is released. There’s a good chance I’ll be setting up at least one more R660 with the same hardware configuration in the near future, so this would be a perfect opportunity to validate the fix.

Thanks again for all your help and attention on this.

[Removing, as proper solution is described below]