I do not know about Nuvi 2xx5 Thai but EU/US model of this device not support Demo.gir in total. IMHO, but offhand the two fact:
1) There are some artefact like in diagnostics page. But I do see no trail in file system or in factory log - manifest.txt.
2) Even in SW there is no mention of Demo.gir files or STR_DEMO_MODE text string.
P.S. Though may be Demo module is included in SW and it blocked after satellite first fix as old device where Demo.gir was automatically removed by SW after first fix...