op25's :stable image has no lsusb, and /op25/devices answers count 0 instead of unknown, so the dashboard said radio-box 'reports 0 SDRs' with 2 plugged in. Prefer the secondary-sdr container's lsusb count; treat 0 from op25 as unknown. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>