You can use the ROM flash tool corresponding to the mobile phone manufacturer or the 360 ??flash assistant to flash the phone. The ROM package does not need to be decompressed. As for the extraction software, what I know is that after rooting, it is used by the RE file manager Enter the designated folder to extract it. Of course, the foolproof and easiest way is to use backup software to back up the software. Go to the backup folder and the apk you want is there

You can also use the Internet Method:

(1). Install apk file decompilation and back-compilation tool v1.8.0 beta version

1. Run the installation directly

The installation path is OK Do not modify, just default, and then confirm 2. Just press Enter in this step

3. Smooth installation process

4. Next, directly enter 2 and press Enter

5. Just choose one of the two options

6. Finally, the installation was successful

7. The installation is completed, and then directly enter the root directory of the system disk (mine is K drive) is the installation directory, and you can see the installation files.

8. But we don’t need to enter this folder to run, its functions have been integrated into the right-click menu, which is very convenient!

9. Haha, now we can see the icon of the apk program itself

(2). First, unzip the downloaded official original flash package ROM (as shown below)

(3). Next, find the two files you want, Calculator.apk and Calculator.odex, in the system\app path and copy them directly to the system\framework directory

(4). Right-click the odex file to merge it into apk

(5). Just press the Enter key to confirm. After it finishes executing and automatically closes the window, you can see the just merged under the framework folder. Successful Calculator.apk file

Some people may ask here, is it possible to copy the merged apk program directly to the mobile phone and install it!? Haha, this is a good idea. If you copy and install it directly, you will be prompted that the application is not installed.

Therefore, there is still a very important step - signature! (6) Signature apk program directly selects Calculator.apk and then right-clicks and selects "Signed apk file"

After it ends, you will find that the file Calculator-signed.apk is generated in the folder< /p>

At this point, the apk file has been extracted, merged and signed successfully. Now you can install the apk directly