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Root Help installing a stock app

I want to reinstall a stock app called Audio Postcard on my Galaxy S 4G, because I want to be able to update when a system update comes out, and I don't want to wait until then to frantically figure this out.

This is what I have tried:

I downloaded the files named: audiopostcard.apk and audiopostcard.odex and pushed them to system/app. They didn't have the right permissions or user and group, so I fixed that in Root Explorer and abd. The two files now have the right permission and user group assignments (root.root). I rebooted, but the app still won't show up. I have heard that as long as the files have the right permissions and user and group assignment then you don't have to install it. However, since it didn't show up I tried installing it, but it fails with the "not installed" message.

I tried to install it using adb, but I got the following error message:

./adb install /Android/AudioPostcard.apk
2125 KB/s (11202488 bytes in 5.147s)
pkg: /data/local/tmp/AudioPostcard.apk
Failure [INSTALL_FAILED_DEXOPT]

I tried installing it by zipping the two files (audiopostcard.apk and audiopostcard.odex) together, putting it in the root directory of the SD card, rebooting into recovery and installing it, but I get the message:

E: signature verification failed

My phone is rooted, but I don't have clockworkmod installed. Do I need to do this to get the files to install?

Can someone help me with this?

TIA
 
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