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Help Hard Brick

Hello I have a little problem.
I purchased a Samsung Galaxy S2X From koodo, and I rooted it.
Because koodo is owned by telus, I follow the guides for the telus version.
Anyway I installed CM9, and got my phone to how I wanted it, but then I realized I got half the battery life that I did on stock.
Stock: 16 hours, CM9: About 8.
So I went looking for ways to improve my battery life, and I flashed Siyah to it, and now my phone is hard bricked. I'm taking it to koodo to get fixed, but what went wrong with the flashing? I want to try to get cm9 AND good battery life when I get my phone fixed, so is there any tips so I can avoid a hard brick again, because I really want to try Siyah, and have CM9 because I hate the stock look, even after changing all the stock apps.
 
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