Restart phone, put it manually it Upgrade mode (usually it's done by holding both vol buttons and power button - may differ by phone. 0 to the Android Debug Bridge (ADB) port. There are various reasons to flash “Stock Firmware on Huawei P8 Lite ALE-L21”. Method to that may vary from device to device, but here are some ideas. The specific Huawei P8 Lite ALE-L21 Stock Firmware Download Package comes with a Stock ROM of Huawei P8 Lite ALE-L21. The necessary communication between your device and PC. It contain flash file, Flash tool & driver packages. 2) Double click the update package, select the I Agree and click on Next. Huawei xml flasher Using this tool, we will bring your dead Huawei phone back to normal working condition.