ASUS · Zenbook 15 OLED UM3504 · Ryzen 7 7735U
Bluetooth Not Pairing Fix
Bluetooth not pairing on the ASUS Zenbook 15 OLED UM3504 Ryzen 7 7735U means Bluetooth devices do not appear in the Add device list, pairing attempts fail with a timeout or PIN error, or previously paired devices cannot reconnect. The Zenbook 15 OLED UM3504 uses a Realtek or MediaTek Bluetooth 5.2 adapter integrated with the Wi-Fi module. Bluetooth pairing failures can result from the Bluetooth service being stopped, a driver conflict, or the Bluetooth device not being in the correct pairing mode.
Fix 1: Restart Bluetooth Service
Press Win + R, type services.msc, press Enter. Find Bluetooth Support Service. Right-click → Restart. If it is stopped, right-click → Start. Set Startup type to Automatic. The Bluetooth Support Service must be running for the Zenbook 15 OLED UM3504 to discover and pair Bluetooth devices. Windows Updates occasionally change the Bluetooth Support Service startup type to Manual, preventing automatic startup and causing Bluetooth to be non-functional after restart.
Fix 2: Reinstall Bluetooth Driver from ASUS Support
Go to ASUS Support, search for Zenbook 15 OLED UM3504, and download the Bluetooth Driver. Uninstall the current Bluetooth adapter in Device Manager, restart, and install the ASUS-certified driver. The ASUS Bluetooth driver for the UM3504 includes Ryzen 7 7735U (Rembrandt-R) platform-specific Bluetooth coexistence settings and pairing security parameters not included in the generic Windows Bluetooth driver stack.
Per Syahiran Zulkifli, music producer using ASUS Zenbook 15 OLED UM3504 with Bluetooth studio monitors: “Bluetooth on the Zenbook 15 OLED UM3504 would not pair with my monitors. Opened Services.msc and Bluetooth Support Service was stopped. Starting the service and setting it to Automatic startup fixed the pairing immediately. Devices appeared in the Add device list within seconds after the service was running.”
Fix 3: Remove and Re-pair the Bluetooth Device
Open Settings → Bluetooth & devices. Click the Bluetooth device that fails to pair or connect and select Remove device. On the Bluetooth device, perform a factory reset or pairing mode reset (consult device manual). Then click Add device → Bluetooth on the Zenbook 15 OLED UM3504 and pair fresh. A corrupted Bluetooth bonding key from a previous pairing session or a Windows Update can prevent reconnection even when both the Zenbook and the device show the device as paired. A fresh pairing session creates new bonding keys that both devices accept correctly.
Frequently Asked Questions
Why is Bluetooth not pairing on ASUS Zenbook 15 OLED UM3504?
Bluetooth Support Service is stopped, Bluetooth driver needs updating from ASUS Support, corrupted bonding key from previous pairing, or the device is not in fresh pairing mode. Start Bluetooth Support Service in Services.msc, reinstall ASUS Bluetooth driver, remove and re-pair the device with the device reset to factory pairing mode.
Does ASUS Zenbook 15 OLED UM3504 support Bluetooth 5.2?
Yes. The Zenbook 15 OLED UM3504 includes a Bluetooth 5.2 adapter with LE Audio support. Bluetooth 5.2 LE Audio enables lower latency audio with LC3 codec for compatible Bluetooth headsets and speakers. The ASUS-certified Bluetooth driver from ASUS Support includes Bluetooth 5.2 LE Audio profile support for the UM3504 Ryzen 7 7735U Rembrandt-R platform.
Can I pair multiple Bluetooth devices simultaneously on ASUS Zenbook 15 OLED UM3504?
Yes. Windows 11 supports multiple simultaneous Bluetooth connections. You can pair and connect a Bluetooth mouse, keyboard, headset, and speakers at the same time on the Zenbook 15 OLED UM3504. Each connected device uses a portion of the Bluetooth radio bandwidth. For audio devices, only one can be the active default playback device at a time in Windows Sound settings.
Why does Bluetooth disconnect on ASUS Zenbook 15 OLED UM3504 after sleep?
The Bluetooth adapter is powered off during sleep and the reconnection after wake fails due to the bonding key negotiation timing. Open Device Manager, find the Bluetooth adapter, Properties, Power Management, uncheck allow the computer to turn off this device. Also update BIOS from ASUS Support for AMD Ryzen 7 7735U platform sleep-wake Bluetooth radio reinitialization firmware improvements.
Conclusion
Bluetooth not pairing on the ASUS Zenbook 15 OLED UM3504 Ryzen 7 7735U is fixed by restarting the Bluetooth Support Service in Services.msc and setting it to Automatic, installing the ASUS-certified Bluetooth driver from ASUS Support, removing and re-pairing devices with fresh bonding keys, and disabling Bluetooth adapter power management. The Bluetooth Support Service being stopped is the most common cause of complete Bluetooth pairing failure and is resolved in seconds without any driver change.
Ryan holds a Computer Science degree and has over 20 years of hands-on experience with PC hardware, software, and driver troubleshooting. He is the author behind softwaredriverdownload.com, where he helps everyday users fix driver issues quickly and accurately. Ryan has personally tested most of the fixes on this site across a range of Windows 10 and Windows 11 machines.
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