1. A hearing device comprising: a processing unit configured to compensate for hearing loss of a user of the hearing device; and a memory unit; wherein the memory unit has stored therein: a hearing device identifier, and model data comprising model information data indicative of available models for the hearing device, the model information data comprising first model information and a signature; and wherein the processing unit is configured to: verify the model data, and proceed to a model update mode if verification of the model data fails.