Follow the below instructions to Soft Reset your Android Box, also you will find the Video Tutorial at the end of textual instructions:
01.Start your Box as normal
02.From Home screen of your Box go into Settings
03.Click on More Settings
04.Click on Backup and Reset and make sure Automatic restore option is Tick checked
05.Click on Factory Data Reset
06.Click on Reset Device
07.Once you will click on Reset Device you will get an popup screen “Do you want to erase everything”, Tick check the option and click OK
08.Now the Box will start erasing the data and will restart with fresh Factory Settings
09.Once you will be back to the Home Screen of your Box give it around 20-30 mins till it will restore the preinstalled Apps like Kodi and then you can reinstall Addons or other Applications on your Box.
Here is the Video Tutorial on How To Factory Reset Your Android Box: