By Attributes
Step 1 - Be sure that you have enabled these options: (From Appearance Theme Options Variation Swatches)
Step 2 - Go to Products → Attributes then create the variation is the brand and change the swatch type into Custom Image. Then, you must provide an image for each Variation by clicking the Edit each Variation and upload its image.
You will then get a result like this
Step 3 - Next, please add and custom attributes on the Single Product
Step 4 - Final, navigate to Appearance → Theme Options → Product Brands and enable this feature
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