I came across the HardReset.info guide while trying to unlock a SUNMI V2 Pro that was locked to a previous merchant account. For those unfamiliar, the SUNMI V2 Pro isn’t a standard Android phone; it’s an enterprise POS terminal, so unlocking it is trickier than a typical factory reset.
Sometimes a device seems "bricked" when it is actually just dead. Ensure it is charging by trying a different cable if the screen doesn't light up. How to unlock SUNMI V2 Pro - HardReset.info