changing apk assets without decompiling

I have an APK, i want to change some assets for a buyer.

I dont have the keystore file.

I opened the apk as an archive using 7Zip program.

I deleted some assets and replaced them.

When installing that APK to phone it didnt work.

So what is the way to do it.

Or can it not be done as you have to sign the compiled apk each time?

Well, let me make it simple for you head over to the Use APKTool to Decompile, Edit, Translate and Recompile an APK » MIUI-Au, it will guide you through “changing the assets of apk without decompling”.