Note: 1, according to the model, restore to the corresponding version of HarmonyOS System 2 before upgrading, including but not limited to EMUI 10, EMUI 1 1, etc. , so collectively referred to as the official stable version of EMUI.
2. If the version is rolled back and you don't want to upgrade the new version for the time being, you need to turn off "WLAN Automatic Download" and "Install at Night" in "Settings-System and Update-Software Update-Settings" in the upper right corner, otherwise the new version will be upgraded automatically at night.
Precautions:
1. Please ensure that the official version of Huawei is currently used, and it is HarmonyOS System 2 version, and there is no unofficial version upgrade, otherwise there is a risk of unsuccessful rollback, and even unknown problems may be introduced. If the unofficial system package has been upgraded, it is recommended to back up important data (third-party applications such as QQ and WeChat need to be backed up separately) and go to Huawei Customer Service Center to restore the system.
2. Please ensure that the current version has not undergone any unlocking or root operation. If there is unlocking or root operation, it is recommended to back up important data (third-party applications such as QQ and WeChat need to be backed up separately) and go to Huawei Customer Service Center to restore the system.
3. The rollback operation will erase all data. Before rollback, please back up all important data to PC or cloud, especially QQ, WeChat and third-party software, and ensure that the backup content is complete and effective.
4. Please ensure that the mobile phone has enough remaining power (it is recommended that the remaining power of the mobile phone is more than 50%).
5. Before returning the goods, please turn off the mobile phone retrieval function (find my mobile phone) and restore the factory settings once to ensure that the remaining space is sufficient.
6. Before rollback, please manually upgrade Huawei Mobile Assistant on the computer to the latest version.
7. After rollback, the mobile phone will automatically restart. Please wait patiently for about 10 minutes. After the rollback is successful, the default theme of EMUI will be displayed on the mobile phone desktop.
Taking Huawei P40 Pro mobile phone as an example, the steps of rolling back the version are as follows:
Step 1: Open Huawei Mobile Assistant on the computer (Windows system), click the part indicated by the arrow in the lower left corner ("Huawei Mobile Assistant"+version number), and click Upgrade in the pop-up box to upgrade Huawei Mobile Assistant to the latest version.
Step 2: Connect the USB cable to the computer, select "Transfer file" on the mobile phone, and then click "OK" in the pop-up "Allow USB debugging" dialog box.
Step 3: Install Huawei Mobile Assistant on your mobile phone.
In the dialog box "Huawei Mobile Assistant Client matching this machine will be installed on your mobile device to provide device management services", click "OK".
Step 4: After the installation is completed, agree and authorize the relevant permissions on the computer/mobile phone side in turn, complete the connection between devices, and carry out subsequent operations.
Open the mobile assistant on the mobile phone to check the connection verification code, then enter the verification code on the computer and click "Connect Now".
Step 5: Click "System Update" on the computer.
Step 6: Click "Switch to another version" on the system update interface that pops up on the computer.
Step 7: Click "Restore" and "Version Rollback" on the computer side. Please make sure that after the data backup is completed (third-party applications such as QQ and WeChat need to be backed up separately), in the pop-up "HarmonyOS system is currently being used, and the special application of HarmonyOS system will be lost if you back up. Are you sure you want to drop back to Android? " Click "Back" in the dialog box.
Step 8: Just wait for the progress to be completed.
Related links are as follows: reservation service, consignment service, Huawei customer service center, maintenance spare parts price inquiry.