Special services for different types of models in OOP

This question is language-agnostic for OOP languages.

I have two classes: DeviceA and DeviceB, which inherit from model class Device. I need to implement two services DeviceAService and DeviceBService, which inherit from DeviceService. My language does not support generics and I need to implement methods with a Device parameter in DeviceService, that will be overloaded in DeviceAService and DeviceBService and implemented differently according to the type of the Device. Then I want to call these functions from the generic DeviceService.

What is the best practice to design this? Is the use of if and check on class type non-avoidable here? Another idea to optimally realize this design?