How to recovery deleted system app by kingroot I accidentally deleted some bloatware apps in kingroot by rooting my device these were (Downloading manager,gallery etc.)

Now my smartphone is not working properly:


My play store is not downloading any app.
My browser is not downloading any thing. 
I have no gallery in it (I have installed a gallery.apk but it's no showing anything in it).
When I go to my ringtone system the setting stops.
There is no sound on incoming call (even if my volume is full).


Can I recovery or get back all deleted system apps? Please help me, I am very sad for two months.
Open Kingroot, go to Purify. Click Tools at the bottom, then Bloatware Remover, then tap the little picture of a man and bin in the top right corner. This will allow you to undelete system apps. Cheers!