Upon upgrading my iphone 5s from 7.0.4 to 7.0.6 it seemed to complete but was locked in a totally black screen. Apple forums recommended restore to factory settings and then restore from backup. From looking at the forum more than a few people had this problem. So I …
1) plugged my iphone into my Mac, it was recognized
2) restored to factory settings…during all this it downloaded updated iOS software
3) restored from backup…required I verify at iTunes Store with my Apple ID.
4) once that completed I synced things up with some changes to verify ok.
All the contacts, photos, etc came back fine.