When our app flags a video as 'low quality', it indicates that noise reduction and/or deep restoration is required.
Use one of three factory presets during processing depending on what level of upscaling you want to achieve:
Enhanced UHD 4K
Enhanced, No Upscaling
All three of these presets apply the generic variant of our Deep Restoration 2 filter to denoise, deblur and upscale (expect, of course, in the case of Enhance, No Upscaling) low-quality input.