I am desperate for fw 6270 - factory version too.
My rns 510 is version 'S' which means the gps chipset is newer, I believe from 'R' onwards.
This means older firmware 4x or 5x can not be installed. only 6x onwards
My radio was bought new, off ebay with version 6276, which is a hashed firmware to enable video in montion.
Due to having lots of problems, teething issues with my radio, and lots of research, there does seem to be a common pattern!
That common pattern is that most issues are solved with unmessed factory firmware.
That is why I really need fw 6270, if there is anyone that can supply me this? Please.
Ady