Much like the tech support person who asks if you've plugged in your computer: did you find the address for just the picture and not the picture off it's home site? Did you right click and view image so it's the only thing on the screen? That's the address you want. I've never seen that error any time I've been working on the wiki, so I'm at a loss as to why it would be happening.
As for replacing, I'd leave the existing photo up, and add yours to the page. There can be multiple images of the same thing on the wiki pages, especially when you're talking about the equipment.
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