Is it a Chinese version?
I only ask as there are a lot of Chinese versions on ebay that do not have RDS. These normally have an arrow button either side of the screen. If yours is a UK version it might be you need to select RDS or Radio station text in the menu but I can't remember ever having to do it on the ones i have installed in the past.
That's a Chinese head unit. No RDS :(
Hiya. Sorry, didn't mean to imply it is a copy. The head unit is intended for the Chinese market however there are way too many copies on ebay to tell. It's still an ok head unit just has some limited functionality.