A few questions for you so people can help you.
- what box do you have
- what version of Kodi or xbmc are you running?
- if you have reset it sounds like the original set of apps present in the original firmware have been reloaded
- similarly it sounds like a set of original default Addons have been installed as part of the reset (maybe part of the firmware for your box or via a pre installed wizard).
On the limited information given, it sounds like your best bet would be to update Kodi and your Addons set either using a wizard like wookie lite or installing manually if you are comfortable doing that.
Regarding the android apps, you will need to delete ones you don't need and reinstall a new set via Google play, aptoide or droid box market.
If you can provide the info requested. I may be able to help more.