The safest method is using the built-in system update tool. Users can navigate to Settings > System & updates > Software update to download official packages directly from Huawei.
The Huawei P10 Lite Go to product viewer dialog for this item. huawei p10 lite firmware flash tool link
When the process finishes, the phone will reboot. (removing the battery or SD card during flashing can cause a hard brick). The safest method is using the built-in system update tool