iPhone stuck on apple logo screen?

My apple iphone 3g 16 gb is stuck on its apple logo… i’ve tried a hard reboot, i’ve tried holding both buttons and connecting it to my computer… i’ve just been reading countless solutions with none of them that fit my situation i also have the electricity (lightning bolt) problem that disappears after i go to the screen with just the apple logo ps. sometimes when the apple logo is up in has the small circle that it shows when the iphone is normally loading something can anyone help?

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Accidently upgraded my iphone 3gs to 3.1.3?

Well, After 1 week of having my iphone stuck in apple logo after messing with sbsettings I thought it was time to do something else, so i decided to send it to a friend or someone, my little cousin was exctied to do it, I was desperate so I decided not to sub estimate his skills. But what he did was TODAY upgrading to the last version that Itunes gave him. He thinks he solved it, and well, I let him thinks that, because he tried a lot. However, I think he messed it up. I dont know my baseband.
I dont know if its old botroom, I think yes, since in the iphone says Model No and begins with A1
I just know that I need my iphone URGENTLY in 1-3 days, I dont care if I cant call, etc. I just want to use my iphone applications, jailbreak it, etc. I cant use the phone since I need a sim to activate it something like that. > I was thinking to buy an Itouch but I think its not the best solution, and my budget isnt so good to do so. So please, any help? THANKS
BEST REGARDS

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