"Flash mode" is the problem.
"Flash is on/off" is the solution.
("is" is important here. "flash on" has many ways to be interpreted because it's missing a verb.)
Your UI should be understandable from text alone if needed.
I can understand why designers and even developers want to not use text: Handling multiple languages is annoying and getting people to read is impossible.
But you know what? I don't understand what that fucking black-and-white hieroglyph you pulled out of your ass five days ago fucking means.
Compare that to a checkbox next to "Flash is disabled". Or a toggle. Or a button. The control and its vague state or bad color blindness choices doesn't even matter if you're clear with your words.