Plasma finds this be to be hurting.

So, long story short, yes, you can revive your plants. Prune of the fully dead branches, remove all dried up and useless leaves. Just leave healthy stalks and leaves. Initially, you should only use clean water to help the plant. Nutrients won't be metabolized properly by a half dead plant. You can safely go back to your nute regime when the plants look a bit healthier. Also, it is key you stick to your water schedule, not to wet and not dry, blah blah blah, you get the drill.

Good luck, also remember that starting over might still be a viable option.

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