Can you change the value of a variable that is reset by a parameter?

Sorry if this is simple but I just crashed a package and can't do an autopsy. I suspect I sent it into an infinite loop. I know you can't change the value of any passed in parameters. What I tried to do was have the parameter set the value of a variable
and then I tried to change the value of the variable. Is that even allowed?
I was trying to do this:
MyCheckVariable = MyParameter (which equals true)
(some cool stuff happens)
MyCheckVariable = False
I hit F5 and my package turned into the Energizer Bunny. Is the way I try to reset the variable the culprit?

This is a prototype so I just created a project parameter and set it to true. In the real world the parameter will be used to control an optional part of the process because on a re-run after error that part doesn't have to be ran again.
So when I say MyCheckVariable = MyParameter (which equals true) in reality what I actually have is in the variables window I'm using an expression and it looks like this in the variables window
name = runDownload
Scope = Package
Data Type = Boolean
Value = True (but greyed out)
Expression = @[$Project::param_runDownload]

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