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i have an acer iconia one 7 b1-770 7 inch tablet. i accidentally changed the screenlock code and don’t know the new code. i tried opening the recovery window volume up and on/off buttons but the screen shows fastboot on the bottom left hand side of the screen and stays on this screen. how do i unlock it?

Try Hard Resetting your tablet with the guide below. Hard Resetting your tablet will erase all of its data! https://www.hardreset.info/devices/acer/