My Captivate turns on, but the first screen it gets to is the AT&T screen, and it goes no further, just shutting down and going into a loop. It will not go into download mode. Would a USB jig be able to fix it? Also, if it does indeed get my phone into download mode, what exactly would I do from there? I ask that because the reason why my phone is in this state to begin with is because I went into download mode and tried to flash it to the stock firmware with Odin. I'd appreciate any help you could give me.