Audio Fix / setup help
FiiO BTR15: answer the intended incoming call with Multifunction
FiiO BTR15 — answer the intended incoming call with Multifunction. Use the stated exact hardware and connection scope.
Manufacturer-documented Reviewed 2026-11-09 · Revision 1
Follow these checks in Audio Fix →When this guide applies
Exact FiiO BTR15. The phone displays an ordinary incoming call and you intend to answer through BTR15. This is not a USB-DAC call path.
Connection scope: Bluetooth. Symptom: Sound changes during calls.
This is a documented check, not a diagnosis of your equipment. The model name does not confirm the selected input, mode, software or connected partner.
If your exact model or a required setting is unknown, use the “I don’t know” branch below. Do not apply a similarly named model’s instructions.
Checks and possible outcomes
Start at scope. Follow the link that matches what you actually observe. Alternative branches are not a single sequence of actions.
scope
Confirm the model and connection
The phone displays an ordinary incoming call and you intend to answer through BTR15. This is not a USB-DAC call path.
Look for: Confirm this exact setup and observation before continuing.
- If Yes, I confirm → Confirm normal BT operation
- If No / my setup differs → Continue with source and model support
- If I cannot confirm → More information is required
- Manufacturer-documented FiiO BTR15 — official menu ↗Menu entry, brightness, charge protection, car mode and version — The exact BTR15 menu offers charge protection stopping at80%, display brightness, USB/car power behaviour and installed-version display. Enter using Power about 2 seconds, navigate with volume buttons and confirm with Multifunction.Exact FiiO BTR15. No physical disassembly, battery repair or firmware installation. · Source checked 2026-11-09
a1
Confirm normal BT operation
Confirm BTR15 is on its normal screen, BT-connected for calls and outside the menu.
Look for: Observe the named indication or available control; stop if absent.
- If I completed this check → Wait for the intended call
- If I cannot complete this → Continue with source and model support
- If I cannot determine this → More information is required
- Manufacturer-documented FiiO BTR15 — official menu ↗Menu entry, brightness, charge protection, car mode and version — The exact BTR15 menu offers charge protection stopping at80%, display brightness, USB/car power behaviour and installed-version display. Enter using Power about 2 seconds, navigate with volume buttons and confirm with Multifunction.Exact FiiO BTR15. No physical disassembly, battery repair or firmware installation. · Source checked 2026-11-09
a2
Wait for the intended call
Use an agreed incoming call you want to answer.
Look for: Observe the named indication or available control; stop if absent.
- If I completed this check → Short-press Multifunction once
- If I cannot complete this → Continue with source and model support
- If I cannot determine this → More information is required
- Manufacturer-documented FiiO BTR15 — official menu ↗Menu entry, brightness, charge protection, car mode and version — The exact BTR15 menu offers charge protection stopping at80%, display brightness, USB/car power behaviour and installed-version display. Enter using Power about 2 seconds, navigate with volume buttons and confirm with Multifunction.Exact FiiO BTR15. No physical disassembly, battery repair or firmware installation. · Source checked 2026-11-09
a3
Short-press Multifunction once
Short-press Multifunction while the call is incoming. Do not long-press, which rejects it, or repeat during the active call.
Look for: Observe the named indication or available control; stop if absent.
- If I completed this check → Check the result
- If I cannot complete this → Continue with source and model support
- If I cannot determine this → More information is required
- Manufacturer-documented FiiO BTR15 — official menu ↗Menu entry, brightness, charge protection, car mode and version — The exact BTR15 menu offers charge protection stopping at80%, display brightness, USB/car power behaviour and installed-version display. Enter using Power about 2 seconds, navigate with volume buttons and confirm with Multifunction.Exact FiiO BTR15. No physical disassembly, battery repair or firmware installation. · Source checked 2026-11-09
observe
Check the result
Was the intended incoming call answered through BTR15?
Look for: Confirm this exact setup and observation before continuing.
- If Yes, I confirm → Checks completed
- If No / my setup differs → Continue with source and model support
- If I cannot confirm → More information is required
- Manufacturer-documented FiiO BTR15 — official menu ↗Menu entry, brightness, charge protection, car mode and version — The exact BTR15 menu offers charge protection stopping at80%, display brightness, USB/car power behaviour and installed-version display. Enter using Power about 2 seconds, navigate with volume buttons and confirm with Multifunction.Exact FiiO BTR15. No physical disassembly, battery repair or firmware installation. · Source checked 2026-11-09
Possible result
More information is required
An unknown state is not a diagnosis. Record the last visible indication and consult the exact model instructions.
insufficient data
Reaching this result does not mean the issue is solved. Only your own feedback can report improvement.
Possible result
Continue with source and model support
Keep the source, connection and last observation. Do not reset, open equipment or change full-scale output to compensate for an unconfirmed result.
next support
Reaching this result does not mean the issue is solved. Only your own feedback can report improvement.
Possible result
Checks completed
The requested observation was confirmed in this setup. It does not establish a hardware repair or guarantee another source behaves the same.
steps completed
Reaching this result does not mean the issue is solved. Only your own feedback can report improvement.