To revert back to 6.1 you have to use smart switch
Open the Samsung Members app and withdraw from the beta program.
Install Samsung Smart Switch on your PC and connect your phone with a data USB cable.
Fully backup your phone using Smart Switch onto your PC.
Go into settings and look for Auto Blocking. When you find it, it will appear to be turned off. But click to reveal two additional switches that are grayed out, but enabled. One of these blocks software from loading via USB and will miss you up if you try to roll back the software without disabling it first. To do so, turn the main Auto blocking switch ON. Now the sub-switches will be accessible. Turn them OFF. Now, turn the main auto blocking switch back OFF.
Go back into Smart Switch on your PC and press "downgrade" leaving your phone connected to the PC via the USB data cable. It will take awhile, but now the phone will accept the 6.0 rollback and reset your phone. Once this process has completed, go back into Smart Switch and RESTORE your phone from the files you previously backed up to the PC.
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