I did do that,... And sometimes it even freeze's on the patch installation.
Then you ****ed around with more files...
I had same problem as you after i replaced eboot etc when i didnt know anything about it and it worked perfect for me when removing patch and reinstalling it...
Try this;
Remove update the normal way.
Start filemanager and delete the BLES folder if its still there... (dont know exact folder name anymore)
Reboot ps3, start game and update.
Make sure you see the intro of blackops behind the patch screen.
If that fails, reinstall OFW then CFW...