I have just updated my phone and now it won't turn back on. The display is currently black with the apple logo and a lot of sentences in white writing at the top all starting [NAND]????? what can i do to fix this?

I have just downloaded the new update and now my phone wont turn back on. The screen is blank with this across the top on the page:
[NAND]_findflashmediaandkeepout:601 physical nand blcok offset1......... (several more sentences similar to this saying error etc)
This happened before when the battery went dead and i plugged it in to charge, but started working again after a while. This time however its not doing anything.
HELP!

Might be hardware failure. Take the iPhone to the nearest Apple store
for evaluation. Make a Genius Bar appointment to avoid delay at the store.
Make a Genius Bar Reservation
http://www.apple.com/retail/geniusbar/

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I have just updated my phone and now it won't turn back on. The display is currently black with the apple logo and a lot of sentences in white writing at the top all starting [NAND]????? what can i do to fix this?

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