The exclusivity of this error stems from three deliberate design choices:

The Z3X ecosystem requires all components to be synchronized.

The most common culprit is the driver for the Z3x Box's internal smart card reader. Windows often sees the Z3x box not just as a phone interface, but as a generic USB Smart Card Reader. If Windows Update installs a generic Microsoft driver for the smart card reader, it may conflict with the proprietary drivers required by the Z3x software. The software tries to read the card, but the generic driver locks it into an "exclusive" mode that prevents third-party applications from accessing the encryption keys.

The Z3X box uses Microsoft’s PC/SC framework. Here’s the clean install:

The internet is filled with bad advice. Here is what to do when facing the "Card Not Found" error.

To resolve the "Card Not Found" error, try the following: