2. Select the ROM package with the ROM assistant, and after loading it into the system, directly delete the "pre-installed software" according to the prompt of the ROM assistant. You can also read other software and delete unnecessary software;

3. Use the ROM assistant, select the ROM package, open the pre-installed APK, and click Add to add the APK file.

4. Turn on ROM assistant performance optimization, and optimize battery performance, GPS accuracy, startup time, touch optimization, mobile phone sliding sensitivity optimization, GPU rendering, etc. with one click, so as to completely renovate the mobile phone and make it run smoothly;

5. sign the ROM or APK in the ROM assistant. Select the ROM file to be signed, and the system will sign it for you directly. After signing, the system will automatically remind you that the signing was successful, and prompt the new file name to start with Signde. Finally, just go to the folder where the signature is successful, that is, the original folder, and find the file starting with signde, that is, the signed file.