Hard Reset BQ BQ-4072 Strike Mini

First method:

In the first step turn off the mobile by holding the Power key for a few moments.{{image1}}
Then start pressing Volume Up and Power buttons together for a couple of seconds.{{image2}}
Release all keys when the BQ logo pops up.
In this mode select "wipe data/factory reset" by using Volume keys to navigate and the Power button to confirm that.{{image5}}
Now choose "yes" from the menu and click the Power key.{{image4}}
At the end select "reboot system now" with the Power button.{{image3}}
Well done!