Which IC lk or D8?
Redmi 6a Mi & frp account can be unlocked using only Authenticated Id.
In case if you own a one, then you can use Redmi 6a Mi account & frp file to flash.
By flashing, it will reset the password within the phone.
Most of the Vivo phones can be unlocked through MRT Dongle.
Mi Qualcomm Phones can be unlocked in UMT tool
Either try Hard Reset & if it fails then you have to flash.
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