This is the most common fixable cause. The contact pins inside the Avengers Tool that read the Smart Card collect dust or lose spring tension. A layer of non-conductive oxide on the card’s gold contacts makes the tool think the slot is empty.
By following these steps, you can get your Avengers Tool back to unlocking, flashing, and repairing IMEI without the "Missing Smart Card" headache. avengers tool missing smart card best
Are you using the or the compact USB Dongle ? What operating system version is your computer running? This is the most common fixable cause