1, you can't upgrade if the power is less than 20%. Please fully charge your mobile phone before upgrading. Do not interrupt the upgrade manually during the upgrade process, for example, press and hold the power button for more than 10 seconds.

2. Is the mobile phone equipped with an SD card? If so, please take out the SD card and try again. Incompatibility between mobile phones and SD cards of certain brands or formats may lead to upgrade failure.

3. Before downloading the upgrade package, there is not enough space in the mobile phone memory or SD card to upgrade. It is recommended that you clear the memory or SD card of your mobile phone to sufficient storage space before upgrading.