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notJamesLee wrote:

I assigned one pair to A /- and the other pair to B /- on the high voltage section of the driver.

Good, that is correct.
Set the microstepping switches to 4 or 8, set the current to 2A for now, power on, see if the motors lock.
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Additional info:
Those drives do not use the TB6600 chip despite having that plastered all over, they use the TB67S109AFTG, they are much better than TB6600 although a bit less current, do more microsteps, have some protections so can handle some incidents while 6600 can not.
All in all, much better chips.
The only issue i encountered with them is the DIP switches tend to cause issues due to vibrations, 4 out of 20 had this issue, can be easily fixed by soldering or cutting switch pins

Bambu can shove it up...
Long live VORON, so here is the link to my mods for using the round rails on Y and Z axis, get some hydraulic cylinder rods, some LMUU8 or 10 or 12 and procure a single MGN12 rail and carriage for X, everything else you can easily found. Skip this if you can find all 7 square linear rails required.
www.printables.com/@Toma3D_1991434/models
Print parts in PETG if you can not do ABS or HIPS (yes HIPS is very good when you get past "it curls more than ABS", it does not), and when finished, print ABS or HIPS and dismantle the printer to change all 3D printed parts.
PETG does yield a bit, so screws become loose with time requiring re-tightening occasionally, but absolutely very usable for several years of daily use.
And a friendly warning, use good flexible cable, the only thing failing on all of my Voron's is the cabling that i had to extend as i can not find good cable here.