Vortex Strikefire red dot issue

robab

CGN frequent flyer
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Hi guys
Have a vortex strikefire 2 on my ar. The dot is green. It used to be red which I prefer. I hold the button to change to red but no luck. I really don't want to send it back and wait then zero it again etc. any thoughts.
 
It's a strike fire 2 and I've tried quickly pressing the button as per the instructions. Perhaps I'll just send back.
 
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