Since the nougat update early this month, my battery has been draining faster. i did try the clear cache, put my screen resolution almost dark, hard reset, no change. I realized i must go back to marshmallow (Android 6.0). can i bring my Galaxy A5 2017 to the fido store i took it?
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Unfortunately, I am doubtful that the Fido stores will be willing to, or even are able to downgrade the OS version on your phone since it involves flashing the ROM. Your options would be to take it to a third party cellular phone repair shop. They would likely have the tools required to downgrade the OS. Alternatively, if you are comfortable, there are many websites providing instructions on how to do so. Either way, you should make sure you have backups of your phone's information and settings.
Hope this helps