How to change the color of a QR code?

The image I was working with was pretty low quality, so I couldn't just convert it to monochrome. The colors kind of bleed into each other, and Illustrator has a hard time figuring out where one color ends and another begins. To get around that, I ended up creating my own QR code using QRCodeFactor.com and exported it as an SVG file. worked perfectly for what I needed.

If anyone knows how to handle this kind of thing directly in Illustrator, I’d love to hear how you do it!

Simple steps 

Import qr code in to the Photoshop

Go to adjustments and select hua saturation and decrease black to white in the below option 

This is simple to black to white dont take more stress about this.

Thanks 

Count the squares and then let Object > Make Object mosaic vectorize it. Works well with QR codes.

Update: 

The image is quite low quality which is why I can't simply convert it to monochrome. Because the boundries of the colores are blurry and Illustrator doesn't know where each color begins and ends. I exported my own QR code from https://www.qrcode-monkey.com and exported it in SVG. This solves my issue. If any of you know how to do this in Illustrator, please let me know.