I have modded several devices over the years to activate features and or to improve the device. For example: added a master switch so I could kill all lights, including Brake Lights and Backup Lights on several of my cars. Communications Scanners, to unlock frequencies/bands, increase the scan speed, to access the IFF, add PC interface, etc. Have done some of the the above to Shortwave Radios. Have modded CB radios to work out of band. Use an old style 46MHz Cordless Phone that has Voice Scrambling(Inversion)to decrypt Police comms. I have a database of codes,to enter the "Service Mode Menus" for many Brands and models of Office Machines, including Copiers, Mailing Machine, Meters, Fax Machines, Printers(Impact, Laser, LED, Thermal and Solid Ink)Digital Scales, Inserters, Routers, PCs, etc.
My current experiments are with IR Cameras for night vision. www.supercircuits.com