"Erro: Boot Certification verify" HELP

Good day Guys, I am new to the forum and I need your help, I have a LG Optimus L7 II in which I was doing a Hard Reset and now he no longer starts, is showing the message " Erro: Boot Certification verify,secure booting erro! Cause: boot Certification verify "and then displays a lilac screen to try conseter I tried to install the stock rom but when I put the download mode in cell appears this same screen with this same mistake and will not, even to carry him this appearing this screen. Could you help me, please? I have been desperate.

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