Nexus 4 SoftBrick - Bootloop?

Hi, i sold my Nexus 4 to my friend, but time latter he said to me that it doesn't start, it's like a Boot loop, i tried to do a factory reset, flash roms, flash factory imagen and using Nexus toolkit but nothing... (And when i Boot it charging, it give to me the red light, when i had it, it gave to me when it was booting but charging)
What can i do, please help me D:
I need the money, Uncharted 4 will realese soon!

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