This is a collection of Huawei P9 stock ROMs / firmware for all variants. Try not to use any of the firmware package on this page to flash any other device that does fit the P9 variants listed here. It will cause the device to brick.
Learn how to root Huawei P9 without stress
Download the firmware package from below and do not forget to post in comments section if your Huawei P9 variant stock ROM is not listed here.
How to flash Huawei P9 Stock Firmware
and follow the instructions in the post to flash any of the firmware in this post on your Huawei P9 variant.