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Try a reset, select the left button of two on the screen that appears, then try each of the three? After that, conclude that it is Japanese- or Korean or Chinese- only, period.
But: most by far of the pages that reference it are in oriental or Japanese characters! So I surmise it is a Japanese-language-only with perhaps Korean and Chinese as alternate settings. I cannot find any definitive references to language for that model.
But tell me the exact and full model, and I will research further, specifically to that model. The initial setup screen with language choices, will probably be what you get once you reset the device to factory settings. English being prodominant, the left-most button of three would be one to choose, if you have a model that can be set to English at all. If you get a screen of language with two buttons, on the lower left and on the lower right, you probably should select the left-hand button, then select one of possibly three languages. But in any case, language changing is usually the first screen on initial setup. I suspect you may have acquired a Japanese -and-Korean-and-perhaps-Chinese -language-only model. So if it is in Japanese, presumably you don't have that model. If it is a CN-NVD905U, then that has only three languages: English, French, and Spanish. That depends upon the exact model of Strada that you have. I will do my best to provide the right answer to your question. I have the site that contains the SW but am n.