Consulting MB001 related issues

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Hi,there.
We want to build a similar wireless imaging system (using the MB001 analog camera mentioned in your paper); we bought the MB001 camera from a company in China, but the camera has 'Auto Gain Control' function; 'Automatic Gain Control' function affects the image display (the image is overexposed; in the image, we can only see a large circle of white area, and the animal's cerebral cortex cannot be seen clearly). The pictures below are the camera imaging image (the central area of the image is very bright), and the picture of MB001’s parameters.

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Have you encountered a similar problem, any suggestions for this?
Look forward to hearing from you soon.
Best Wishes.