why is my techno y6 displaying unfotunately phone has stopped

[AC Question]

it started by downloading apps on its own when mobile data is turned on, i uninstalled some apps and installed cm security which helped to keep the phone working for some time but now its not working at all it just displays unfortunately phone has stopped

 

[AlphaTango414]

Boot into recovery and factory data reset the device. You will lose all saved data on the device. Back up what you need if possible first.