There is not an option to select only one color to ink flush on the G3202. You will need to perform the all color ink flush to flush out the wrong ink. Please click HERE and scroll down to system cleaning on the page that opens.
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Not clear what you did. Did you: 1. put a black tank in the blue slot or; 2. are you refilling tanks and put black ink into a blue tank? Either way, you now have a blue printhead that is contaminated with black ink.
Any of the printer cleaning/flushing operations cannot wash out a tank. A flush will only clean the printhead, using a lot of whatever ink is in the tank supplying that head.
It would seem you need to put an uncontaminated blue tank in the proper slot and do flushes to wash the black out of the blue printhead. And it may not do it completely, and it'd be expensive. You could need head replacement.