@Lezli
If it has HWID 1517 which is the usual one for US/EU nuvi 2797 it can probably be converted to dezl 760 or Camper-RV 760, all of them share the same PCB P/N of 105-01878-02 but with differing HWIDs of course. The dezl is 1516 and the Camper/RV is 1730.

We can help you with the conversion attempts however cannot say that a full conversion will succeed. You may need additional 'unit specific' files normally loaded at the factory and which GarminExpress doesn't supply for instance. There is also no guarantee that the pin-outs to the device mounts as supplied for the nuvi and the others is the same, certainly the mounts differ for the dezl/Camper-RV when packaged with a backup camera and the nuvi doesn't list BCx0 in it's optional accessory list nor is it listed as a compatible device for the camera. You may need to do some additional research to satisfy yourself if you find the use of a backing camera important.