Modern Xiaomi MTK devices require an authorized service account to flash via SP Flash Tool. To bypass this restriction for free, use an open-source MTK Auth Bypass Tool. Launch the on your PC. Click on the Bypass button. Power off your Redmi 6 completely.
Custom recovery installations or formatting attempts fail because the flashing software cannot bypass Xiaomi's secure boot protection. redmi 6 preloader file
In the field, click choose and select MT6762_Android_scatter.txt from your extracted ROM images folder. Modern Xiaomi MTK devices require an authorized service
Install the latest MTK VCOM drivers so your PC can communicate with the phone in its low-level boot state. redmi 6 preloader file