Mobotix One-Custom Exposure Windows

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I don’t see a “custom” exposure window that I can set on the web interface of the camera for a M1A-S. I do see “custom” on MxManagement 2.52 .And, MxManagement will let me set a custom window. But it is only temporary. Did Mobotix strip the ability to do custom exposure windows for the M-One. Or, is this a mistake in the firmware? I am currently using MX-V8.0.1.42-r4.