OverviewTECNO J7Boom

With the device switched off, press and hold the Volume Up key and the Power button. As soon as the Android logo appears, release the keys. Then press the Power button to open the Recovery Mode. Select "Wipe...

When the device is turned off, press the Volume Down key and the Power button at the same time. Once you see the TECNO logo on the display,  release the keys. Press the Power button and the Volume Up key...

With the phone turned on, go to "Settings". In Settings select "Backup & Reset". Then choose "Factory data reset". Click on "Reset phone" and "Erase...

The device must be on. Go to "Settings" . In Settings go for "Language and input". Finally select "Language".