I lost my user guides, what can I do? 13 September 2022 10:12 Updated The full Theta user guide is available only online. Please visit the product page and go to the 'support' section and select your model and access the user guide. Related articles I have difficulties to use my product(s) even after reading the user guide; can you provide specific assistance? How to contact technical assistance? Theta is damaged and does not work properly, what should I do? Where can I access the global FAQ? What is the warranty period for refurbished products?