i went in to cydia today. it said i had some packages i could update. they were, specifically, a theme update and the five columns and five rows update. i pressed the upgrade button and it went into the upgrade process. it then said restart springboard. i pressed the button and it closed and went into the boot logo. i thought nothing was wrong until it wouldnt do anything. its been three hours since this happened, and my ipod is still stuck in the boot logo. what should i do?