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The probe finds the SX1262 (TCXO 1.8 V works) and measures the antenna path: the Cap's PI4IOE5V6408 at 0x43 must drive P0 high, or the receiver is deaf (-111.9 dBm flat vs -87 to -94 dBm with P0 high). DIO2 makes no difference to reception. Receive only; the radio is left asleep. RadioLib 7.8.1 + probe: +23.6 KB flash, +656 B static RAM (release). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT