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Wordpay Worldpay/Vantiv requires the XML format which can be set via uDemo
In KB mode, send "52 1F" in ITP wrap to retrieve settings, and send "52 22" to retrieve the full FW version
SREDKey 2 starts to support multi-keys from V1.03.011 firmware hence the firmware can't be downgraded to an earlier version, otherwise, the key variant will change from Data to MAC which will cause decryption failure with the default Data key variant (TS-30394). The problem caused by FW downgrading can be corrected by upgrading the firmware back to V1.01.011 or above.