IPhone 3GS jailbreak problem?

I bought an iPhone 3GS off of craigslist. The previous owner hadn't used it in a little over a year, so the battery wasn't charged when I got it. I charged it up and updated it to ios 6.1.2. I figured out that i couldn't unlock it yet with ios 6.1.2. I tried using redsn0w to downgrade it to 5.1.1 so I can unlock it. When I go through the process of jailbreaking it, it seems to work fine. When the screen starts having a black screen with words scrolling down, it stops. When it gets stuck there, the charge eventually runs out and the iPhone dies. What is wrong and how can i fix it? Also, the battery doesn't seems to hold a charge for long, is there a way I can fix this without buying a new battery? Is there an easy way I can 'jump start' the battery so it works properly?

There's an option in redsn0w called "Just Boot", try that first to see if it'll work for you.

This link will show you step by step, and it will help you avoid all errors and problems, i have a 3gs also

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