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Update xnnpack_README.md adding warning for unsupported ndk version #5854

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6 changes: 5 additions & 1 deletion examples/demo-apps/android/LlamaDemo/docs/delegates/xnnpack_README.md
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Expand Up @@ -16,7 +16,11 @@ Phone verified: OnePlus 12, OnePlus 9 Pro. Samsung S23 (Llama only), Samsung S24

## Prerequisites
* Install [Java 17 JDK](https://www.oracle.com/java/technologies/javase/jdk17-archive-downloads.html).
* Install the [Android SDK API Level 34](https://developer.android.com/about/versions/15/setup-sdk) and [Android NDK 26.3.11579264](https://developer.android.com/studio/projects/install-ndk).
* Install the [Android SDK API Level 34](https://developer.android.com/about/versions/15/setup-sdk) and [Android NDK 26.3.11579264](https://developer.android.com/studio/projects/install-ndk). **WARNING** NDK r27 will cause issues like:
```
java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "_ZTVNSt6__ndk114basic_ifstreamIcNS_11char_traitsIcEEEE" referenced by "/data/app/~~F5IwquaXUZPdLpSEYA-JGA==/com.example.executorchllamademo-FSyx80gEhsQCsxz7hvS2Ew==/lib/arm64/libexecutorch.so"...
```
Please downgrade to version 26.3.11579264.
* If you have Android Studio set up, you can install them with
* Android Studio Settings -> Language & Frameworks -> Android SDK -> SDK Platforms -> Check the row with API Level 34.
* Android Studio Settings -> Language & Frameworks -> Android SDK -> SDK Tools -> Check NDK (Side by side) row.
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