That link was helpful. Thank you!
I didn't expect that the flat side of the 4-pin female connector should slide onto the 4-pin male connector's guide side because I thought the slightly slimmer guide was meant for a different pinout. Here's what worked for me and it looks like it is confirmed by the link you shared.
A. ─Black─┼ Fan Pin #1-Ground (-) [Close to PC rear]
B. ─Red──┤ Fan Pin #2-Power (+12V)
C. ─Yellow─┼ Fan Pin #3-Signal (Tacheometer output)
D. ─Blue──┤ Fan Pin #4-PWM Control
Regarding question number two; I was wondering if there are some unobvious settings in BIOS version J63 v03.96 which need to be configured to recognize the Pulse Width Modulation.
Or if there're other recommended ways to modulate the fans using software for Windows 11 Pro and Ubuntu >=22.04? (question 3).