First of all, the mobile phone needs to be cracked. The tools required are: PY platform, mobile drawing, and mbmtool. These are all available in the forum, so I won't upload them separately.
Install the theme you want to modify (it is recommended to install it in the mobile phone. The card installation will be slow. I am talking about the C drive as an example below) and then open the mbm file (you can open it to see if it is the theme you want to change) Copy this mbm file to the C drive → python → mbmtool → mbm folder, open mbmtool, click disk C → right, do you see the mbm file? Click → Options → Unpack, then exit, open the manager C drive → python → mbmtool → img folder, and see some pictures. The first picture is the menu background picture, the second picture is the standby interface picture, and the last picture is the music background. You can rename the picture you like with the same name as those three pictures and move it into the img folder to cover it. Now, the most important thing is the third picture. Do you see it? It's one strip. If you look closely, you'll find that it's exactly the same as the top strip in the first picture! You also need to change it, otherwise the top part of the menu will not match the picture you put in (you don't understand, just follow it and you will know). Here you need to use mobile drawing. Open the mobile drawing → File → Open the image and select the image you moved. Move to the first picture covered in the img folder, and then click Select. It will let you choose the resolution. You choose 240*28, then click Edit → Copy → OK
(Don't move the steering wheel, just cut the top one), and then click Text File → Create a new image, the resolution is still 240*28, then click Edit → Paste → OK, and finally click File → Save Image As, done, then rename the image to be the same as the third image in the img folder, move it in and overwrite it, open mbmtool → Working Disk C → Options → Package, don't change the name if it is *, exit mbmtool, open the manager C drive → python → mbmtool → mbm folder, see the * just now. Is there any mbm file?
Rename it to the same name as the mbm file you just copied, and then move it to the place where you just copied the mbm file, which is the C drive → python → mbmtool → img → overwrite it in 38af76, and then select this theme to see if it has been changed.