If you’re having issues with Boom j7 and you need a Factory Reset(Hardreset) , Here’s a tutorial on How to Hardreset Tecno Boom J7
Note : Hardresetting your smartphone will delete all your data , so you are strongly advised to have a backup before you proceed.
How to Hardreset Tecno Boom J7
Open app drawer , Navigate to Settings >> Backup and Reset
Click on Factory data Reset
Confirm the process by clicking on Reset phone
Wait for your phone to reboot.
•Power off your phone
•Hold the volume Down and unlock button together(hold for few seconds) . your phone will boot into engineering mode.
•use your volume buttons to scroll down and select Factory reset or Delete all Data.
•Confirm your selection.
Once the process is complete , your phone will automatically reboot.