Button Lose Efficacy; Adaptive Brightness Function Is Failed/Delay; Speaker Issue; Bluetooth Issue - OnePlus 6T Troubleshooting Manual

Freezing while loading Apps
Please back up all the data, clear phone's cache, then restore the factory setting or flash to the
official latest OS version.
If the steps above did not solve the issue, we recommend applying for after-sales service

Button Lose Efficacy

Button can be pressed with good hand feel but no function, it is recommended to apply for after-sales service.

Adaptive Brightness Function Is Failed/Delay

Adaptive brightness function is failed/delay.
Install "sensor list" app to check whether light sensor works or
not: https://play.google.com/store/apps/details?id=com.miian.android.sensors&hl=en
1. Please try to use the device in a different light condition or environment.
2. Open Settings -->Display to check whether Reading mode or Night mode is enabled.
3. If the issue still persist try to clear cache, back up all the data and flash to the latest OS version.

Speaker Issue

Speaker issue may include the phenomena below:
No sound from the speaker;
Speaker sound quality - Sound quality is abnormal;
Low volume issue;
Check whether the alert slider is in the "Ring" mode and adjust volume to a high level;
1.
2. Make sure the speaker hole is clean, not blocked by foreign matters;
3. Restart the phone to check if the issue persists.
If actions above are not helping, please contact with OnePlus after-sale support.

Bluetooth issue

Bluetooth unable to connect
1. Please cross-check if the issue occurs when another Bluetooth device is used;
2. If the issue only persists in one Bluetooth device, the root cause may be that Bluetooth device is
incompatible with handsets;