This may be late for some of you, but more information about performing the firmware update with the DOS bootable USB drive, and the methods and procedures for Secure Erase can be found in the Magician 4.0 application.
When Magician 4.0 is running, at the very bottom of its screen is a Help button, slightly right of center. Clicking that will cause a new window to open with a list ot topics, including FW updates and SE instructions. I used the instructions for performing a SE in Windows 8, which is only done with the DOS bootable USB drive method, and explains how to make the SE screen readable by installing a font, and running the SE from the DOS command line.
The Security Freeze Lock message is explained, and is just a message that can be ignored. Power cycling the SSD is necessary "in some cases", and is supposed to be displayed when it is needed. As was explained earlier, that involves disconnecting the SATA power connection from the SSD while the PC is running, and then connecting it again. Intel has the same procedure when using their SE utility on Intel SSDs. An unusual procedure, true, but valid in this case.