[REQUEST FOR HELP] Android Head Unit (Kapud TS18 - UIS8581A) – Poor Bluetooth Call Quality (HFP) Even with External Microphone

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Hi everyone,I’m using an Android head unit in my car, brand Kapud, based on the TS18 platform, with the following specs:CPU: Unisoc UIS8581A (Octa-Core Cortex-A55)Android: 11Interface: TLink (simulated Android Auto wireless)Microphone: External mic installed (confirmed working)The issue:I’m experiencing poor call quality via Bluetooth (HFP) — muffled or distorted audio, even though I’ve already:Verified that the external mic is activeSet both microphone gain and call...Read more