Redmi Note 9 merlinnfc V13.0.2.0.SJOMIXM twrp recovery.Before fastboot flash, disable verity and verification.adb reboot bootloaderfastboot devicesfastboot --disable verity --disable verification vbmata vbmeta.img // disable verity and verificationfastboot boot recovery.img // to test recovery before flashfastboot flash recovery reoovery.img // flash recovery into recovery slotfastboot reboot or fastboot reboot recoveryX