If you can get back to the bootloader you can try to flash the 4.4.2 version you had on the phone before you started. The FXZ files and the tools you need are here on the forum, A quick search for the build should yeld the results you need. Unless you are unlocked there isn't much else that can be done. If you are not sure what build you were on I would start with 4.4.2.183.46.10 if that doesn't work then the .15 build is the last resort. If you are unlocked there is more, but I would start with this:
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