greeting everybody

i'v opened ygopro.apk as an archive using 7-zip and reached the textures folder but I couldn't modify it [:sad:]

I've tried the these steps
1 - extract the archive
2 - change the theme
3 - zip it again (compression normal - no password)
4 - change the extension to apk
but this didn't work [:sad:]

is there a program to edit the apk archive?

---