What is the RESCUE location of the switch for? 31 March 2023 10:14 Updated See Chapter 4, point 12. ART of the manual of an AF amplifier bit. Related articles What is the UPGRADE location of the switch for? How should I set up the ART/UPGRADE switch? 9. TROUBLESHOOTING I suspect that my product is a fake product, so I would like to ask you to verify that. What information do I have to provide you with / what is the procedure to follow? How can I tell if the product that I purchased / that I would like to purchase is fake?