Force recovery method. First go to the emui website (/plugin.php?id=hwdownload) to download the software version corresponding to your mobile phone. Since the mobile phone cannot be turned on, the following recovery method will cause your data to be lost. Please make a backup of key data on a regular basis. SD card local upgrade 1. Prepare an SD card with a capacity of 2G or more and ensure that the available space is larger than the upgrade package size. It is recommended to use brands such as Sandisk, Kingstone, or Kingmax. 2. Create the "dload" folder in the root directory of the SD card, and put the downloaded software upgrade package "UPDATE.APP" into the dload folder. 3. Plug in the charger, press and hold the volume up and down buttons, and press and hold the power button for more than 10 seconds to turn on the phone. The phone will enter the SD card to force an upgrade. If it cannot be started due to battery drain or low power, charge it before upgrading to ensure that the phone can start. Please insert the charger during the upgrade process, otherwise the upgrade will fail if the battery is insufficient. 4. The mobile phone will automatically complete the upgrade after entering the upgrade. The upgrade usually takes about 5 minutes. If the upgrade fails, you can try again. , if it still doesn’t work, take the warranty card to the nearby Huawei official customer service center for maintenance, and back up the data in advance! You can first log in to the homepage of the Huawei Mall website, click on the after-sales outlet at the bottom of the homepage, and check the after-sales service center near you. Since it is a National Day holiday, you can call first to ask if anyone is working at the after-sales service center.