PR-620/620C/600II/600IIC FAQs & Troubleshooting PR-620/620C/600II/600IIC Not your product? Sort by Updated Date Popularity 1 Results 1. 25/02/2009 I tried to update the machine with USB media and pushed "USB HOST". But the screen didn't change for more than 5 minutes and I still can't upgrade it. Software FAQs & Troubleshooting