That's when you go to recovery, do a nandroid backup and install the zip file. Hopefully, guidot can help you out from here because I have to go.
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ok so i got all that other stuff figured out..... downloaded rom manager, flashed recovery, than downloaded a cyanogen mod rom, chose back up files, wide data and cache, and then it went and started backinng up files and flashing the rom, took a lonnnng time. now its stuck in bootloader....been there for like 5 min. what should i do ???? help quick