Since yours is at 11.6, you can directly upgrade to 10.18 without any problems, which precisely complies with the "system must be at firmware level V10.x prior to starting this update" wording.
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Since yours is at 11.6, you can directly upgrade to 10.18 without any problems, which precisely complies with the "system must be at firmware level V10.x prior to starting this update" wording.