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I have Miui ,so no. and I dont see an option to change it back in System tuner.Can't you just restore your build.prop in System Tuner?
Anyway, it looks like System Tuner adds the line:
debug.sf.nobootanimation=1
I didn't think that would even work, but I suppose you could change it to 0 or just remove that line.
As always, you should back up build.prop before screwing with it!
Just a thought... Are you fairly sure you didn't disable it in Cm7 performance settings? Maybe check that first?
I have Miui ,so no. and I dont see an option to change it back in System tuner.

In System Tuner, on the Build page, where you changed it (using the presets button), there are buttons next to it for backup and restore. Hit restore and pick the backup you made before adding the tweaks. Also on that same screen you can scroll through the build.prop and manually delete and edit individual lines, which you'll have to do if you didn't hit Backup before you added the edits.
Edit
The particular line I mentioned above should be colored blue... to help you find it.

Just did the restore, it Worked Thank you![]()