I have a Samsung Galaxy S2 (SPH-D710) and was trying to do a firmware upgrade through Kies and the upgrade encountered an error (I think the usb cable came loose and lost connection). After that, when I tried booting the phone a screen appears with a yellow triangle with an exclamation point in the middle, a phone to the left of it and computer to the right with the message "Firmware upgrade encountered an issue. Please select recovery mode in Kies & try again". I tried doing the emergency firmware recovery in Kies but that seemed to freeze at 64%. I wasn't sure how long it was supposed to take so I let it sit there. Eventually the battery level went low enough that the recovery failed and now the battery is too low to boot into download/recovery mode. When I plug the phone in to try to charge the battery the "Firmware upgrade encountered an issue. Please select recovery mode in Kies & try again" screen flashes and it doesn't seem like the battery is charging. Is my phone completely screwed? Is there anything I can do at home to fix this or will I have to take it somewhere?