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If you know how to flash the rom through Fastboot try that. Don't go to service centre until unless your phone is in warranty, they will make your phone Motherboard dead. ASUS Technical team is worst.
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it would be safer if you install a security update https://dlcdnets.asus.com/pub/ASUS/ZenFone/ZS661KS/UL-ASUS_I003_1-ASUS-31.0210.0210.272-1.1.5-2304-u...
Is it fixing the device is not certified ?
Yes, it was always certified, I never encountered such a problem. But I am getting security update warning.