The problem for rooting this device is finding a working twrp recovery file. Now to reboot your phone in Recovery So after many tries on my Huawei P9 Lite, i
Are you sure you run from inside the folder where adb.exe and fastboot.exe is? Boot to bootloader and use terminal pointed to fastboot.exe. Shift+right click -> open command line here. Make sure your devices is listed: adb devices. If device is shown: adb reboot bootloader, to reboot to bootloader. If not, install adb drivers / huawei drivers.
I had the same problem, same fault while trying to unlock boot loader. After I disabled “Phone-Finder“ in the Huawei menu or security option, then I could unlock the bootloader. Also in my dev-menu, the “oem-unlock“ option is not available. Seems, on the EVA-AL versions, those options are linked to each other.

The cmd code: ''fastboot'' does not give the wanted result (not found). As windows does not recognize the correct phone, I tried to install a new Huawei USB driver. The problem is, that Windows says the Android Sooner driver is already the best driver available. * Android reboot reason: AP_S_COLDBOOT NA. Volumekey_down_press_process_func

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    • huawei p9 lite restart problem