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Did you check the boxes to clear/format before installing the rom?

I just checked and the ZapX rom is for Froyo (android 2.3.15), not for your current version 2.3.340. You have to be careful of that. I love RM, especially for managing backups, but it does show you roms that aren't safe to install.

If you still can get into recovery, I'd format/clear cache, then try loading your backup again.
 
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