If there is a problem with the firmware, how can I fix it?

After a system error warning message appeared, the power no longer turned on. What should I fix? I haven't taken any backups, so I need to restore the data.

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@e7qoyj0eor57eiy what is the exact model for your Huawei phone? What have you checked and what have you tried?

Nova lite 2.

”Your device has failed verification and may not work properly. Your device will boot in 5 seconds." After this message, my phone got to be dead boot.

I prepared a same model and transferred the motherboard, but it didn't improve.

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