1. Issue with searching radio stations (SCAN)
Even with the RDS option is disabled, I always getting the error "Search for radio stations failed!" when i try to scan all radio stations. When this error occurs, the radio stations are not shown in the all list, and the list remains empty.
At the end of this process (60 sec. +) scanned radio stations are saved, probably in the app service in background, so I can changing them using the SWC commands, but the all list are still empty on Client-UI Radio App and I have to manually mark them as favorites to save them on all list (Next SWC command then mark as fav etc..) !

Formatting Issues
When the system language is Serbian, there is a problem with the display format of radio stations, your developers probably format the stations values using Locale.getDefault() -> formatting with dot should be the standard for displaying radio stations for all languages. (This is a problem in navbar too, when I select AC temp to display on Navbar, temp value has wrong format when Serbian language is selected, also comma instead of dot).
(For example Radio Station -> 91,3 Mhz should be 91.3 Mhz , also for navbar temp value -> 21,5* should be 21.5*)
AM Stations formatting issues
Display of incorrect AM stations format (comma instead of dot) and general display formatting of AM stations is wrong
Saving names of radio stations issues using Editor (duplicate radio stations on the list)
After I entered the names of the radio stations, duplicate stations appeared in all the lists, the next station button does not work, it constantly selects the current radio station, while the previous button works, also using the SWC controls, I have to press the next button twice if I want to move to the next radio station.
AM/FM prefix suggestion
Instead of FM and AM prefixes for radio stations, there could be Mhz or Khz at the end of the radio station value
Favorites list
What is the purpose of the radio app favorite list, since it can't be controlled by SWC, generally this is not a mobile app or music player app, so it can lead to serious safety problems (for example, while driving, I will need to select radio stations from favorites list directly on the head unit display)?
Also the label with the name of "all lists" is redundant!!!
Radio Seek functionality/buttons
Radio station seek buttons function is missing, even if you have all station search function (SCAN and Tune) , this is mandatory and standard for all radio apps, sometimes I don't want to tune 1Mhz by 1Mhz to find next station.
PS values should be default values for saved radio stations on all list or fav list
The PS value should be the default value of the saved radio instead of the radio station number (for example, instead of 91.3 -> PS value (radio station name))
Manually save the radio stations. How to?
How to manually save a radio station (I don't want to put it in the list of favorites, I just want to save it)?
SWC controls
Switching radio stations using the SWC controls does not follow the order of radio stations on the radio app All list (for example using the SWC the last changed radio stationis before the last on the All list, after I select the first station in All list directly from radio app and then I press again the next button on the SWC it returns to the last station on the list instead of going in order, in this case it should go on second station on list but its not a case.
Non ASCII characters values on RDS radio information
Please filter and do not show non-ASCII characters on RDS radio information
PS and RDS displaying
The display of RDS and PS values should be separated, this is not the standard to display them like this, maybe this is a test version, but definitely take a look at how other car radio applications look like
On Launcher desktop (Radio/Music widget) there should be support for displaying RDS informations also
CANBUS Switching between apps
Since I have support to change applications using SWC controls on the steering wheel, this function after switching to DUDU OS does not work properly. For example when I listen the music player and I want to switch to the radio nothing happens, but when I listen to the radio and I want to switch to the music player then sometimes it works and sometimes not this, also switching to Bluetooth music does not work, and switching between FM and AM band. Possibly because Radio/Music player/Bluetooth are part of one application and system cant recognize it.
CANBUS Hiworld support
Do you have a plan to implement support for Hiworld chanbus devices like you did for Rise canbus devices, with Hiworld I can't use DUDU app for vehicle settings, and animation for turn signal and AC informations does not work

Note: I have video for this test cases but I was unable to post here probably because of size!