Blacklisting occurs when the SDP is no longer responding to commands, usually caused by one of the following issues:
A hardware setup issue, e.g. SPORT frame sync not connected/daughterboard not powered.
A hardware fault or unstable power supply. Check USB cables/ports/power supplies.
Failure to reboot after programming LDR into SDRAM (bad LDR/Firmware file).
Less commonly Blacklisted errors can also occur where two applications are using the SDP at the same time and one of them programs the firmware. The SDP is blacklisted until it completes reset.
To fix a blacklisting issue/un-blacklist, try closing down all SDP/Analog Devices applications and power cycling the board. Verify none of the above cases are the cause.