1.IF you flash a stock rom you must untick the preloader then flash your device.
2.If you flash upgrade version of rom or android version you choose firmware upgrade then flash your device.
3.When during flash or completely format your chip and rewrite your stock rom or upgrade rom please you choose to Format all + download , its also dead risk your device completely not power on.
New security devices protected by secure download agent and authentication file required when flashing some Redmi devices need login required from authenticated server when you flash you need service account.
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