Desfire EV1 Communication - How to assign IV

Question

AES-128 authentication process with Desfire EV1 cards goes like this:

• Get Application IDs: 90 6A 00 00 00
• Select Application: 90 5A 00 00 03 10 00 00 00 (AID: 0x000010)
• Start Authentication with a key: 90 AA 00 00 01 02 00 (Key: 0x02)
• Card responses with a random 16 bytes array, lets call that RANDOM_B
• Now card needs more data to continue authentication, so we will do that
• Decrypt RANDOM_B with KEY and an empty IV, lets call that RANDOM_B_DEC
• Left shift 1 byte RANDOM_B_DEC, lets call that RANDOM_B_DEC_LS
• Create a 16 bytes long random array, lets call that RANDOM_A
• Combine RANDOM_A and RANDOM_B_DEC_LS into a single 32 bytes array, lets call that ARRAY
• Encrypt this ARRAY using KEY and RANDOM_B as IV, lets call that ARRAY_ENC
• Send ARRAY_ENC to continue authentication process: 90 AF 00 00 20 + ARRAY_ENC + 00
• Now card responses with 16 bytes shifted and encrypted RANDOM_A and we need to decrypt and compare this with our own RANDOM_A that we created earlier

Here is my question: While decrypting received RANDOM_A (last step) what IV array I must use?

After that, how can I read data from a file in selected and authenticated application? Is this data also received encrypted? If yes, what will I use as IV array for decryption?

Thanks