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Manual Repository: You can check for updated manual uploads at the Rii Manual Download Center. rk908 bluetooth keyboard manual link
If you are looking for the official documentation, here are the most reliable links and guides for the RK908 and its sister models: Here’s a short story inspired by the search
Solution: Remove the device from your OS’s Bluetooth list. Hold Fn + 1 for 10 seconds to reset the Bluetooth module. Re-pair. Also, move any USB 3.0 hubs away from the keyboard – they cause 2.4GHz interference. rk908 bluetooth keyboard manual link