The 4.07 firmware will load on the 1.x boards but will not function as it should as it was designed for the 2.x boards.
Stick with the 4.05 firmware it will do what you need
to flash my sb6121 i used the sb6120 jtag script that can be found in the flashcatusb latest software, my pcb version is 2.1 though, not sure it makes a difference or not ?
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