Failing to optimize APKs

[Guest Gonçalo Silva]

Hi there!

I've been trying to "optimize" some apks using optipng but, unfortunately, the phone stops recognizing the application after I touch it.

I've tried with APK's from /data/app and /system/app, tried signing and not signing, tried just unpacking and repacking and I just can't get the phone to recognize the application after I do anything to it.

Any hints?

Thanks!