Help needed to downgrade OS version on Note4

Hi, I have a Note4 (SM-N910C) and a week back an auto-update has slowed down my phone. The current version on my phone is 6.0.1. I want to downgrade the OS version to 4.X.X/5.X.X. Is it at all possible on this device ? If yes, I would request forum members to please guide me as this I have absolutely no knowledge of this thing.

After some reading, I understood that I need to select a Firmware and use the tool Odin to downgrade. But I am having some trouble choosing a firmware which will...

Help needed to downgrade OS version on Note4

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