google_ad_client = "pub-9939339176541690"; google_ad_channel = "0625013538"; google_ad_width = 336; google_ad_height = 280; google_ad_format = "336x280_as"; google_ad_type = "text"; google_color_border = "FFFFFF"; google_color_bg = "FFFFFF"; google_color_link = "0000FF"; google_color_text = "999999"; google_color_url = "191919"; There are some questions frequently asked by users and tried to provide answers to users to resolve their issues. It is the R4 OS / firmware can be upgraded? A: [...]