If your Koga dongle shows a yellow exclamation mark in or fails to pair with devices, try these verified fixes: Question - BT adapter not working | Tom's Hardware Forum
If the Hardware ID matches Broadcom:
: While some newer 5.0 dongles require USB 3.0, others suffer from interference on USB 3.0 ports. If your connection is jittery, try moving the dongle to a USB 2.0 port or using a USB extension cable to move it away from the PC chassis. 3. Standard Driver Update via Windows koga bluetooth dongle driver
Because "Koga" is a budget electronics brand, their products often use generic chipset drivers. If the dongle isn't working automatically, you usually need to identify the internal chipset to find the right software. If your Koga dongle shows a yellow exclamation
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