Why are you guys talking about using electronics and whatnot to change the matrix representation of RFID-tags when talking about your gear...? Most things in SR5 are already wireless enabled and will simply broadcast their own device icon.
SR5 p. 420 Wirelss Functionallity
The few devices that are non-wireless are most likely tagged with RFID tags (p. 440).
If you want to change your Chrysler-Nissan Jackrabbit so it instead look like a Mitsubishi Nightsky you just use the the Change Icon Matrix Action (it is a legal Data Processing action that anyone can use, no need for a hacker for this and it will not cause ripples within the matrix for the overwatch division to converge on). You need to use the looks of an icon you already have a copy of or an icon that you designed yourself. Also, unless you run Wrapper (which is a restricted cyberprogram that you normally can't run on a simple commlink) you still have to obey basic matrix protocols (basically meaning that the icon of a vehicle still have to be a "vehicle" of sorts, but besides that you can go nuts -- for example the official Icon of the Ares Mobmaster riot control vehicle is actually a Roman chariot icon complete with reins to drive the vehicle...)
File Icons located on your RFID-tag (that for example display an ARO) can be changed with the Edit File Matrix Action (but you require a mark on the file before you can do that).
SR5 p. 219 Devices
Device icons in the Matrix represent electronic devices in the real world, from your music player to your commlink to your car and beyond. By default, a device’s icon looks like the object it represents, in miniature if the real thing is larger than a person. It has controls of some kind, often the same controls it has in meat space, but not necessarily. The Ares Mobmaster riot control vehicle, for example, is famous for its unorthodox Roman chariot icon complete with reins to drive the vehicle.
Basic Matrix protocols require device icons to provide some hint of their real-life function. A firearm’s icon looks like a weapon (even if that weapon is a tomahawk, like the icon of the Super Warhawk pistol), a vehicle’s icon looks like a vehicle, a lock’s icon looks like a lock, a refrigerator looks like a cold box for food, etc. The restrictions on devices aren’t as stringent as on personas, as long as form suggests function at a glance.
SR5 p. 238 Change Icon
You change the target’s icon to one that you have a copy of or have designed yourself. Changing an icon doesn’t change the results of a Matrix Perception action, but might fool personas who don’t take the time to inspect your new look. You can target your own icon, if you like.
SR5 p. 222 Life with a Commlink
You can choose which of your AROs are seen by which people, so you can keep it private or, if you’re feeling impish, put vulgar AROs on RFID tags and scatter them around town for all to see....
Most of what you keep on your commlink are files, this includes music, your SIN (fake or otherwise), licenses (also fake or otherwise), maps, email messages, your contact book, AROs, and so on.
SR5 p. 215 Matrix Jargon
geo-tagging: Assigning AROs to a specific physical location, often using RFID tags.
SR5 p. 239 Edit File
Edit File allows you to create, change, copy, delete, or protect any kind of file.