mobile

Last night, i accidentally swiped to restore to an older ROM that i had. Not meaning to do this, and beginning to panic, i attempted to stop it, while it was still at 0%. I did this by holding the red button down. As i have now realised how stupid that was, i am wondering if there is any chance to fix it. It is now stuck on the Sony logo. Although i have seen many problems here, i cant find anyone that had the same problem as me. I was running the existenz ROM, and the ROM i was accidentally restoring to was the official ROM. Please help me
Thank you