Anet A8 Reduce Stepper Current

Important
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There is a chance you might destroy either your board or your stepper motor(s) when trying this!
You need to solder resistors on your board. So if you dont know how to solder - sorry this guide is not for you.
Furthermore, you should be able to measure voltages and resistances and be able to understand the marked parts in the schematic.

What is the problem?
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If you own a (older) Anet A8 board chances are that you can not change stepper currents or only the current of the z-axis steppers.
Check https://3dprint.wiki/reprap/anet/electronics/mainboard for more details.

The default current for the steppers is quite high on the Anet A8, which causes the stepper motors to get quite hot and produce a lot of noise.

How to fix this?
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Searching the internet i found the schematics for the board here: https://github.com/ralf-e/ANET-3D-Board-V1.0

As can be seen on the schematic the stepper drivers use a voltage divider with a 100kohm