I also used this for lib only, without creating .bat file, you'll just need to run a cmd or powershell inside the ndk folder that you've downloaded:
ndk-build -C directory-of-the-jni-folder
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Why make it unsigned if at first you didn't modified it? It might be really a corrupted apk. You can send me by dm. And what is the meta? You will only need to drag out the lib folder > delete it inside .zip > bring back the lib folder by dragging in.