flash is not exactly slang for install. Flash creates a clockwork recovery image. Rom manager is not always a rock solid way of installing roms, and eventually will cause an error.
You can't have a double extension (.zip.zip), just one ".zip". You have a backup correct? Pull battery out, hold power and x button down, while still holding insert battery. This should bring you into clockwork recovery. Go to nandroid menu and restore a backup. Let us know if you can/can't get into recovery and you have a backup.
Its Goin right now soo... umm idk why it says update.zip.zip but its supposed to be blacked out rom and the message after its done installing syas the blacked out thing and after i rebbooted it went into the bootloop but after this will i be able to do it?
Blacked out by esnead? I believe that is a theme not a rom. Where did u get it from? You cant install just a theme. You have to install a rom first. Themes are specific to roms and rom version.
sent from my rooted nook color
If you're using CW recovery, don't change the name. In recovery, navigate to "choose zip from sd card", and flash away. If you're using SPRE, after putting file on SD card, rename file to "update", minus quotes. The .zip extension is automatically added.