Default Product Option
This mod allow you to set the default product options from admin panel, when the product (with options) page loaded, one or more options already selected.
This Default product option will works with Select, Radio, Image, and Checkbox option types
Multiple default product options (the option value) only will work with checkbox option type. so for the other types (radio, Image and select) make sure to set only one default option.
Vqmod version 2.5.1 or later (for opencart 2.x.x.x only)
ADMIN CLICK HERE