Is it possible to update the card firmware?

For user safety, The Tangem firmware is downloaded into the chip once and cannot be updated again. This eliminates the risk of installing malware and possible theft of funds.

Updating a hardware wallet’s firmware means that you will have to trust the wallet manufacturer and hope that, at some point, you won't receive an update that compromises your keys.

Tangem’s firmware has undergone two independent audits from Kudelski Security and Riscure. Both audits confirmed the integrity of our system, establishing that the private key was generated using a hardware random number generator and that there are no backdoors or bugs that could lead to the loss of funds.

You can read the detailed reports of both audits. Kudelski Security's audit results are available here, and information about the second audit conducted by Riscure is here.