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Nabu Casa's prebuilt OpenThread RCP image for the ZBT-2 (zbt2_openthread_rcp_2.7.2.0_GitHub-fb0446f53_gsdk_2025.6.2.gbl) runs at 460800 baud, not the module's 115200 default. Aligns the radio URL with the firmware so otbr-agent can actually open the Spinel link after rebuild. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>