sorry tfor the late update but the document is confusing.
as it sais two diferent things.
the right whay of doing it. 8at least what i did in an ft818nd
pins 1,2,3,4,5 open
pins 6,7,8,9 closed
Factory status OXXXOOOOO
FULL TX STATUS: XXXXOOOOO
O=open
X=closed
I hope this avoid the confusion and the scary moment of not booting if you remove pin 6 as the document sais in the seccond part.