How do I fix my Nexus 5 after attempting to flash 5.1?

Hi all
Went to flash stock 5.1 today cos I was sick of waiting. All was fine, backed up using NRT, installed 5.1. Then tried to restore my backup using NRT, and now whenever I turn on the phone it is at the "Welcome: Setup" screen with select a language. The problem is, two errors keep popping up. "Unfortunately, Nfc Service has stopped" and "Unfortunately, Phone has stopped".
I have gone into recovery mode and done both a factory reset and just a cache wipe but neither are solving it.
I would appreciate some help so much if anyone can

Thanks so much in advance.

Maybe you got a bad download. Can you download the Flash ROM again and try to flash it again?

What version is NRT attempting to load? Find where Wugfresh is installed on your computer and go to "WugFresh Development\Nexus Root Toolkit\data\Factory_Images"

There you should find a directory like "hammerhead-LMY47I-factory-df12798".... what do you see there?

And are you doing a full wipe (you can choose to not wipe your userdata with the NRT)?