Robert,
The Meridian Device Manager automatically updates the F/W without user intervention. Just run it and wait a minute. If a firmware update is available, it will take place. If there are multiple devices to be updated, it will take slightly longer because the update process will be sequential, not concurrent.

My 218 is running v1.1 Device Build 218
My 818's ID41 is running v1.2 Device Build 218

I can't help with the IP address. Many seem to have found static IPs troublesome, and I'd only change from DCHP for a very compelling reason (which you may well have). But 10.0.0.6 seems a little unusual (to me). Every router I've owned would want something like 192.168.1.XXX. Someone gifted in the Networking department will undoubtedly shed light here.

While I can't say in good conscience that I've never had a network problem affecting my M gear, I can't recall a single one not easily rectified with an end-to-end reboot from the modem to the end-points, including the Wi-Fi mesh nodes.

Richard
Main: 818v3, DSP7200.2x2, Prime Headphone Amp & Power Supply, Roon Nucleus+ w/Lifetime Sub., Tidal Subscription, UHD722, IP2SL-P (TCP/IP to Serial), Sony Bravia 4K TV, Intel NUC13ANHi7 Pro PC/ Win11Pro/64, iPad Air (5th gen), LinkSys MX8500 Mesh Router (X 4), LinkSys LGS116P 16 Port Switch, PS Audio Power Plant 10.
Basement: 218, DSP5200x2