However, "unsupported" does not mean "dead." In the Android world, the community often outlives the manufacturer. Developers on the XDA Forums have done what Huawei refused to do: they ported Android Oreo to the P8 Lite.
Do not rush to download random ZIP files claiming “Android 8.0 for P8 Lite.” Many sites host malware. Follow this checklist: huawei p8 lite update 8.0 download