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GP 11.4.2.1 makes '10' the superset of '20' (Executable Load Files with their modules), yet the Explore queried '20' plus a separate '10' modules pass and merged the two. A live card answered 6A86 (incorrect P1-P2) to '20' while '10' worked (2026-09-28) - all four P1 values "shall be supported", so this is the guarded-fallback case, not a vendor branch. - Explore now queries '10' (with module parsing) and falls back to '20' (no module lists) only when it yields nothing; a successful fallback drops the primary failure from the result, and the primary error surfaces only when both fail. - The separate P1=10 "modules" pass and ramMergeElfData are gone. 656 frontend / 504 Python green; version 3.6.26; sw simple-v299.