DEC677 25.10 upgrade failed, bricked

[8nvho98w43]

Hello. I have a new Deciso DEC677 appliance that I just pulled out of the box. I connected to the web UI successfully and started upgrading the software.

After several upgrade cycles (I want to say I started at 24.7) I had gotten up to 25.10 (not yet 25.10.1_2) when the upgrade failed mid-upgrade with a red error message stating the upgrade failed (sorry, I didn't get a screenshot). The web UI stopped responding.

I then (stupidly, perhaps) power-cycled the appliance and from then on, the system would only boot into FreeBSD. I downloaded the latest OPNsense installer image to start fresh. The installer loads but then almost immediately freezes after beginning to boot into Multi user mode.

I'm very appreciative for any thoughts or nudges in the right direction. Cheers.