Question about Samsung Galaxy Note 20 Ultra Snapdragon

Hello all, has anyone of you ever reset a Samsung Note 20 Ultra (SM-9860, TGY version. i.e. Hong Kong Snapdragon version) to factory settings? If so, do I have to somehow unlock the country version TGY again with a Hong Kong SIM, or can I immediately use the mobile phone normally in Switzerland again after the reset? It has been in use in the Sunrise network for 2 years without any problems, but due to change of ownership I would like to reset it to factory settings, new owner also with Sunrise network Switzerland.... thank you very much for your answers ...