Phone stuck in ADB sideload I recently try to reset my android phone by power off, power on and volume up button.

There're several option but once I push volume down once and volume up once, it stuck with alarm sign and android logo. Below the logo said 


  Now send the package you want to apply to the device with adb sideload &lt;filename&gt;.zip...'


What should I do to fix this?
if you can't take out the battery of your device and if longpressing whatever does not solve it


install adb on pc.
connect device with usb cable to pc
enter following command on pc

adb sideload /dev/null



the device will complain that file is not valid but it will come out of the sideloading state