Huawei p8 lite update 6.0 emui 4.0 software install failed

Hello all I have a little problem on my phone p8 lite I want to install the version 6.0 emui 4.0 but he will not they give me ''software install failed''
About my phone :
ALE-L21C185B160
version 5.0.1
emui 3.1
dual sim
Help Me please !!!! :(:crying:

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