Q: Iphone Wont Start Up after Deleting Files ?

I was trying to get Youtube working after Jailbreaking and followed advice that said to delete data_ark.plist, device_private_key.pem, device_public_key.pem. This has left phone in emergency only mode or DFU mode. How can I copy the files back in this state, or what other
options could I try ?
Thanks,

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