cant get past home screen
my sister hit a button and it erased everything to where we can only turn it on
If you don't mind losing all your data you can always do a system restore
Power off your device.
Press and hold the Volume Up button, which is located closest to the touchscreen lock switch.
While holding the Volume Up button, press and hold the Power button for 3 seconds then release it.
Continue holding the Volume Up button until your device turns on.
On the Android system recovery screen, select Wipe data/factory reset.
Use the Volume Up and Volume Down keys to navigate through the menus and use the Power button to select the desired option.
When prompted to "Confirm wipe of all user data", select Yes -- delete all user data. Finally select Reboot system now.
You could also try some other troubleshooting here
Hope this helps
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