If missing, the build artifact was never deployed correctly. Assuming you have access to the vendor’s patch repository (or a recovery tarball), reapply the fixed release:
# Stop conflicting services systemctl stop dx80-controller systemctl stop syn213-telemetry cp -r /opt/dx80 /opt/dx80.broken Apply the fixed .ipk or .deb package opkg install /tmp/dx80ce820syn213brelpkg-fixed.ipk --force-reinstall Verify checksums sha256sum /opt/dx80/bin/syn213d | grep "expected_hash_from_vendor" dx80ce820syn213brelpkg fixed
If the hash matches, the package is now consistently fixed . Understanding why it needed fixing prevents recurrence: If missing, the build artifact was never deployed correctly