For testing and fraud detection, the 2021 software includes a simulation mode for the Issuer Authorization Response. You can inject the software with dummy issuer keys to validate whether a card generates a valid ARQC (Authorization Request Cryptogram) correctly.
: Banks and payment processors continuously update their cryptographic keys and "Common Payment Application" (CPA) standards to detect and reject cards produced by unauthorized software like X2. Conclusion emv x2 2021 smartcard software
The software can read data from a source card and write it to a blank Java Card (e.g., J2A040 or JCOP21). For testing and fraud detection, the 2021 software