220-1101 Mobile Devices Practice Question
A user reports that their smartphone's Bluetooth will not pair with their car's hands-free system after a recent OS update. The car's system has been successfully paired with other phones. The technician has reset the phone's network settings and forgotten the car from the Bluetooth list, but the pairing still fails. Which of the following should the technician try NEXT?
⚠ Common exam trap
CompTIA often tests the misconception that a factory reset is the universal fix for all software-related issues, when in reality, targeted updates to the other device's firmware are more appropriate for compatibility problems introduced by an OS update.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check for a firmware update for the car's infotainment system
The car's system works with other phones, so the issue is likely an incompatibility introduced by the smartphone's OS update. Checking for a firmware update for the car's infotainment system is the next logical step because the car's Bluetooth stack may need an update to maintain compatibility with the new OS version's Bluetooth profiles or security requirements (e.g., LE Secure Connections).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Perform a factory reset of the smartphone
Why it's wrong here
A factory reset restores the phone's OS to a clean state but does not alter the car's embedded Bluetooth stack or firmware. If the pairing failure stems from a protocol mismatch introduced by a smartphone OS update, the car's outdated firmware remains unchanged, so the problem persists. This is a data-destructive last resort that bypasses targeted fixes like clearing Bluetooth cache or updating the car's firmware, making it an inefficient first response.
- ✓
Check for a firmware update for the car's infotainment system
Why this is correct
A smartphone OS update can alter Bluetooth version negotiation, security policies, or supported profiles, causing the car's older firmware to no longer recognize the phone. Car manufacturers release infotainment firmware updates precisely to maintain compatibility with the latest mobile OS versions, making this the most targeted next step. Unlike a factory reset or hardware replacement, checking for updates is non-destructive, addresses the root cause, and is the recommended first action in such scenarios.
- ✗
Replace the Bluetooth antenna in the smartphone
Why it's wrong here
The Bluetooth antenna is a physical component responsible for radio transmission; if it were failing, the phone would likely lose all Bluetooth functionality, including discovery and inquiry scans. Since the phone can still discover and attempt pairing, the antenna is functioning correctly. Pairing failures caused by OS/firmware incompatibility are logical errors in negotiation, not RF hardware faults, so replacing the antenna cannot resolve the issue.
- ✗
Disable Wi-Fi on the smartphone before pairing
Why it's wrong here
Wi-Fi and Bluetooth both operate in the 2.4 GHz band, and disabling Wi-Fi can reduce interference, but modern devices use adaptive frequency hopping and packet scheduling to coexist with Wi-Fi. A pairing failure due to a firmware compatibility issue is a logical handshake problem, not a signal-interference problem. Disabling Wi-Fi might help with audio dropouts after pairing, but it does not address the fundamental mismatch between the phone's Bluetooth stack and the car's infotainment firmware.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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