The desire for exclusive audio is understandable. Xiaomi makes some of the most ASMR-friendly UI sounds in the industry. However, the risk/reward ratio for a patched APK is disastrous.
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The sound effects manager is tied to systemUI in MIUI. A poorly patched APK can corrupt the audio driver cache, causing your phone to crash every time you receive a call. To fix this, you often need to perform a factory reset.