Pre-2026-05 Keyence images didn't write pc-subtype.txt via startnet.cmd. Without
a subtype the share manifest's per-model PCTypes gate falls back to the default
(VR-6000), causing the wrong model to install on VR-3000 / VR-5000 boxes.
Detect the installed VR-3000/5000/6000 by its uninstall ProductCode and
persist the subtype so subsequent GE-Enforce cycles + the share manifest gate
route correctly.
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