Banana Pi BPI-M2 User Manual page 11

You can use the GUI to shut down the Banana Pi safely.
Also you can run the command in the terminal:
sudo halt
or
sudo shutdown –h.
This will shut down the PI safely, (just use the power key to turn off might
damage the SD-cards file system). After that you can press the power key for 5
seconds to turn it off.
If all is well ,so you can use banana pi M2 now.
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Banana PI M2 User Manual
www.banana-pi.com
11