How to write back contacts ?

Model : Gionee P4
Problem : Gmail Lock (Need Contacts Back)

Read Data under " UseData/Forensic" – Successfull
Factory Reset – Done

Now i have contacts backup in txt, csv and vcard format.

How to write back data to phone?

I have used "csmatrixit.importcontacts.apk" from playstore but some contacts missing.

Plz help