Grahame5

I'm not sure I'm putting this in the right place here. Never been on here before. As others my Bolero radio in Skoda 2016 Fabia comes on and off with welcome screen, but won't do anything else. I've tried holding the power button in to reset. That does not work. I've removed the radio fuse and disconnected the battery. That doesn't work. I can't see s/number or model codes dates etc as I'm waiting for some removal key's. I called at the local Skoda garage today and they advised there are several service bulletin updates for my radio. They wanted to charge a ridiculous amount to update my software with no guarantee this will fix the issue. Can I do this myself and if so does anyone have the file's I need. Plus how to do it? Any help and advice would be appreciated.