Check the SG to make sure it fermented out. I'm sure it did. I can't see something being stuck that long, and if it had higher sugar and lower alcohol content, I'd think it would have started growing something scary by now.
If it's done, you can do anything you want with it. If it's a big batch, you can even split it and do some with berries and some without.
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"Science + beer = good!"
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