I recently bought 4 of these, older models, new in the box never used, but have a strange problem.
They have 4 coils, 8wires but apparently I can't find the correct wiring.
I can get them to turn but they step at 1.8 degrees and the sticker says 0.9 degrees... , also it looks like they don't produce the correct torque.
Can't find more info on the web, googled for hours: nothing, only their recent models.
Is there anybody out there with a wiring diagram or even better: a datasheet?

Sticker info:
Type: KY56RM1-551
DC 3V
0.9 deg/step
They are Nema23 and 80mm long

It would be a waste of money and time if I can't get them working properly so any help is very much appreciated, would really like to use them.

Thanks,
Luc.