found datasheet of the chip:
https://www.richtek.com/assets/product_file/RT2808A/DS2808A-00.pdf
Thought lifting pin 5 would work but sadly the module won't start anymore.
So after another more careful reading; 100 ohms pulls about 30mah
Max load on a arduino pin is 40mah
So next step will be trying to put a 100 ohm resistor on 2 pins and set these to LOW and HIGH for respectively 5 seconds.
Will report back.