NFC RFID Magic Card USCUID GDMIC Gen4 13.56MHz MF Classic 1K for Proxmark3

Description

NFC RFID Magic Card CUID USCUID GDMIC Gen4 13.56MHz MF Classic 1K for Proxmark3, for pentesting, access control, etc.
This is a true Gen4 Magic card, commonly known as "USCUID" or "GDMIC".  It is
NOT
the "Gen4 Ultimate Magic Card".
Features:
13.56 MHz
Emulates both 4- and 7- byte UID cards of the Classic variety put out by a notoriously litigious Dutch company which likes to file eBay takedowns for naming their brands.
Supports "Gen1a" Chinese Magic mode (not activated by default)
Supports "Alternate Gen1a/GDM" mode (20/23 wUPC1 instead of 40/43)
Supports "Gen2" / "CUID" mode, unrestricted write access to block 0 (also not activated by default)
Supports EV1 Signature Emulation (also also... you get it)
Supports "FUID" mode, where block 0 can be written once using the Gen2/CUID protocol and is locked afterward
Supports "Shadow" mode, where normal writes will be accepted and will read back as written, but will revert to your preset values after a few seconds.  This is useful for systems that write "rolling code" data on the card in an effort to defeat cloning.
If you need ultimate stealth, you can disable all forms of "Magic" access after writing the card (this is irrevocable!)
!! NOTES !! Please read!
This CANNOT, in its default config, be UID changed using the popular MCT Android App.
You can write the user-accessible blocks with MCT or other apps, but cannot change block 0.
The default config is also
NOT COMPATIBLE
with most functions of the Flipper, though there's work on some of the custom firmwares to support GDMIC.
Writing invalid data to the config block can
damage the card in ways that are difficult or impossible to recover
.  It's also possible to write valid configurations that will lock you out of future configuration access permanently.
In summary:
You need a Proxmark, Chameleon or similar specialized tool to fully utilize this.
I can answer most questions about using this, or if there's a particular configuration you want I can write the config before shipping.  Irreversible config writes require payment before writing, and returns will not be accepted.  Please contact before ordering if you want this.
In stock, free domestic shipping from USA.