Pietro
But to be honest, fot me the AF on Dudu 7 works on probably the same level as on Topway TS10. On my trips, I'm driving regulary, it sometimes works as it should, correctly jumps to right strong frequency when signal drops. Sometimes it takes a few minutes of false tries, when it finally manages to jump to correct one. And sometimes it doesn't work at all, constantly trying some wrong noisy frequency or jums to a freqency of completely different station.
So, to sum it all up, we can all agree that the RDS AF is definitely partially broken and this needs to be addressed by Dudu devs. As a few users here already pointed out, they hopefully know about this and will try to improve it, so let's give them time to work ;-)
If needed, I can help with testing, make for example videos of the good or bad behaviour, send RDS data (PI code, AF lists,... ) of affected stations and so on.