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Constellation

S7

So I have two Samsung Galaxy S7's and they both had great batteries until the updates. After the oreo update the batteries are very very bad. On idle only about 2 maybe 3 hours max screen off, AOD off, data off no apps etc. While in use 2 hours is on a lucky day. They are both the SM-G930P sprint Snapdragon models. I replaced the battery on one of them and it did not change a thing. No apps are being used. Does anybody know of a way to root and/or install the older android version agian?