If you want to flash other region stock miui rom or if you want to flash custom recovery then flashing custom roms or rooting your redmi note 9 then you need to unlock boot-loader first. Without unlocking boot-loader we cannot flash any thing.
Warranty may avoid if boot-loader is remain unlocked. For claiming warranty, need to flash stock miui rom first then re-lock boot-loader to get warranty claim.
China variant mobile phones boot-loader must remain unlocked as far you are using custom recovery or custom roms. Always flash stock miui rom then re-lock boot-loader of china variant xiaomi mobile phones.
Mediatek Driver need to be install on windows 7, no need to install on windows 10.
Mi Flash Unlock Tool Version miflash_unlock-en-3.5.1108.44
Mi Flash latest Version
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