By your earlier posts it seems you have a zumo 595. I've not heard of a nuvi with that model number.

A preliminary check needs to be be done to ensure the task can be completed using only GIR_Editor, i.e. without using an hex editor, to insert the image into a BIN file. So you need to supply a copy of the device's region 16 containing the present logo image (see [Only registered and activated users can see links. ] for details on how to copy that using rrgn command). The BMW image that you wish to use will also need to be supplied or a link to an existing one.