Phantom 4 RTK - Regulation Switzerland/France

Hello everyone,
I have a Phantom 4 RTK and I have to perform operations both in France and Switzerland. As far as I understood, my drone has no class label since it was produced before 1st of January and I’m able to fly in A1/A3 Open category. Actually, I can only perform operations in the A3 subcategory because of the 1.4kg weight.

Isn’t possible to perform flights over populated areas in any case?

Moreover, I read that EASA requires a Remote ID. Is the firmware going to be updated in order to have it, or should I buy an external module?

I don’t understand the situation, also because France laws requires to have an external ID module, so the situation is quite confusing.

Does anyone knows how can I fly in both countries given this situation?

Thank you