First and foremost, this is P8 Lite section of the forum. Did you followed unlocking bootloader procedure for P8? Be sure you have unlocked bootloader, otherwise do it again and retry to flash those 4 files extracted with "Huawei Update Extractor" from FULL APP ROM image specific for your P8 GRA-UL00.
How to Fix Huawei P8 lite Battery Drain 1. Reboot your device. You may not realize it, but most device issues may be resolved with a simple reboot. Rebooting the device resets the Huawei P8 lite’s operating system and clears the memory. What’s more, it can even help with battery problems.
I ordered an iFixit essential electronics toolkit from the EU store and a new frame and screen for my Honor 8 Lite (P8 2017). Once I finally got them, I replaced the broken screen and bent frame, but once reassembling everything and booting the device, I get a black screen with EMUI logo requesting me to reboot the system, doing a factory reset
m6FjNc.