The Camera Refuses To Open; Sim Card Issue; Led Flash Of Camera Can Not Be Open; Fast Charge Issue - OnePlus 6T Troubleshooting Manual

The camera refuses to open

When the camera refuses to open, you may Check whether the camera is disabled.
If yes, then go to Settings-->Apps-->Application list-->All Apps Disabled-->Change camera disabled to
enable

SIM Card Issue

SIM related issues may include one or several of the phenomena listed below:
Cannot read SIM card
1. Remove the SIM card to check if SIM card has any damages or is wrongly inserted.
2. Cross-check if the same SIM card can be used in other devices or try a different SIM card.
3. Open "Setting"->"SIM & Network setting" -"SIM Settings" to check whether one of the cards is
deactivated. If yes, please activate it.
4. Change to another SIM card.
If this issue only occurs when using a single SIM card, contact the network operator for a SIM
replacement.
If the issue persists even after trying more than two different SIM cards, please contact OnePlus
for after-sales support.

LED Flash of Camera Can Not Be Open

1. The flash light will be disabled if battery is low, try to charge your battery to a higher level then retry.
2. Check whether the camera is set to the professional shooting mode. In order to achieve a certain effect, the
program will prohibit use of the flash. Please revert back to normal camera shooting mode.
If the issue is not solved, please lease back up all the data, clear the cache and flash to the latest OS version.

Fast charge issue

For issues related to fast charge:
Not Fast charging
Slow charging
Heating during charging
Fast charge cannot be identified
1. Please back up all of your data, clear the cache and flash to the latest OxygenOS version.
2. Check if the device has any battery drain issues. When the phone consumes battery faster, it results in slow
charging.