thoriki,
I used the same serial port connector to jailbreak my Kindle Voyage, and it worked fine with the jumper set on the 1.8v pins. (DSD TECH SH-U09C2 USB to TTL Adapter Built-in FTDI FT232RL)
I did not have any issues with the adapter, and it was easy to set the jumper and connect to the Kindle.
good luck!
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