Smart Prime 6 brick?

Hello, yesterday I tried to update my Vodafone Smart Prime 6. I download my lollipop 5 update but when I tried to install the update my phone it didnt boot up anymore. I tried everything I know but it doesnt boot up anymore. and it also doesnt show as an usb device on my laptop. and when I tried adb sideload it gave an error that it failed to verify whole-file signature.
can someone help me?