Roxim Z3EK Headlight Wiring

I have a Roxim Z3EK bicycle headlight. This light is supposed to have a low and high beam function, but I can only get the low beam to work. So far, I have tried:

• grounding the green wire
• sending 12V+ to green
• sending 12V- to green
• bridging the green and black wires
• bridging the green and white wires

I emailed the manufacturer asking for a wiring diagram, but no response.

I appreciate any guidance y'all might have. Thanks!