After the system is upgraded, the SIM card cannot enter the system.
It is recommended that you back up personal data before upgrade.
1. After the system is upgraded and powered on, many system resources need to be initialized, which takes a long time than normal. This is normal. Please wait for at least 10 minutes to see whether you can enter the system.
2. If you cannot enter the system after a while, press and hold the Power key for about 10 seconds to forcibly restart the mobile phone. If the mobile phone can be powered on after being restarted, it is recommended that you continue using the mobile phone. In the future, you should check whether the mobile phone system is abnormal.
3. If you cannot enter the system after being restarted forcibly, press and hold the Volume Down key + Power key to check whether you can enter the recovery mode. Select Wipe data/factory and reset.After resetting the mobile phone, check whether the mobile phone can be powered on properly.
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