SharkX6 Flight Controller USB data connection cable
Nice picture with enough detail to see useful things.

Looks like the USB data lines are just jumpered (0-ohm resistors) to the U+ U- lines - have you tried that? (along with supplying power as needed) - to be clear don't "pull the data line" anywhere - let the USB device (flight controller) you are connecting to do that. USB power should not be very much (if at all) involved here since there's a power supply already going on.