What you extract from your mobile phone is just an optimized app, which means that this installation package cannot be installed without classes. xde。 You use re browser to enter the system root directory system/app, extract and copy two files, settins.apk and settings.odex, and then decompile the odex file with apk tool and package it into settings. Apk signature to restore the original complete installation package. You can then use the apk tool to modify and sign it.