WT19a won't start after update

Recently I updated my Live w/ Walkman to the 4.1.B.4xx (I think is it), and it worked normally.
Today I tryed to update to the 4.1.b.587 (I think is it), but now it wont start. Just the green led flashes. I tryed with another batery, I've tryed to install a ROM via FlashTool, but nothing worked. I have already searched other posts, but nothing could help me.
What should I do? Should I reclaim the warranty?

PS: The problematic update was done with the PC Companion, so, I think the best way to proceeed is the warranty. But, I had rooted it on the 4.1.B.4xx... It could give me a problem?

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