There is none, and I don't think anybody is working on that. If you have the old hardware, you can downgrade to 1.0, softroot to 2.5.1 and let the device upgrade utself to 1.7. You will keep your root and have 1.7, this is what I did but I have one of the first nook classic.
Do not try to downgrade to 1.0 if you have the newest hardware, you'll brick your nook.
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