For those who pc companion/repair does not work, and I was one ever since I unlocked my bootloader, it maybe the pc that you're using that is the problem.
I installed pc companion on another pc, and in the process of checking that it was ok, one thing led to another, I clicked on repair knowing it won't work on my phone....well it did!
Surprise and joy
turned to surprise and 'what have I done???'
as I watched everything get wiped, when it didn't need to be.
But it's all up and running again with a super clean install
To be honest, I've read about doing this here, but I couldn't see why it would work, but it did.
It's certainly worth trying if your phone is bricked, good luck