Go to the menu > Connection and ensure the COM port matches the one shown in your Bypass tool.

Since many modern MTK devices have a locked BootROM, SP Flash Tool will return an "Authentication Error" unless you bypass it: Open your . Power off your device completely.

: Often the only way to revive a "hard-bricked" phone that won't turn on or enter recovery mode. Format Options

: He clicked 'Download' in the SP Flash Tool and, with the phone powered off, held the Volume Down button while plugging in the USB cable.