[ALE-L21] Software install failed when I want to install EMUI 3.1 as dload

Hello everyone!
I am newbie there so If I did something wrong then I am sorry.
I have a big problem so I so need your help (in sos?).
I am trying install back EMUI 3.1 cause 3.1 was faster and power saver than 4.0.3 so I would to install back 3.1.
I found a zip file which is contain update.app. It has been downloaded from huawei's site (c1.huawei.com). So maybe it is an offical package

I am trying install EMUI 3.1 since yesterday.. But I always got an error (Software install failed). If I install an rollback android 6 to 5 then my recovery is dies. I did everything I saw on xda and other forums.. My phone is unrooted, bootloader is unlocked everything.. I so need EMUI 3.1. Please a helpful person.


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