If SD card method fails completely, use Huawei HiSuite’s “System Recovery” (Erecovery) over Wi-Fi. Requires bootable fastboot mode.

| Error on Screen | Solution | | :--- | :--- | | | The UPDATE.APP is corrupted, incorrect for SCL-U31, or the SD card is not formatted to FAT32. | | Incompatible Version | You are trying to downgrade to an older build. Check for the latest approved version for your region. | | No update file found | Ensure the folder is named exactly dload (lowercase) and the file is named UPDATE.APP (uppercase). | | Stuck at 5% or 95% | The firmware partition is damaged. Try a different SD card (Class 4 or 6 works best for older Huawei devices). |

Press and hold the , Volume Down , and Power Button simultaneously.

Rare with official firmware, but if it happens, you need to root and restore the modem partition via a backup. Write-protected IMEI is usually safe.

: Use a microSD card (Class 10 recommended) formatted to FAT32 .