How do Rollback my Huawei G7 L-01

Hello friends,

How do I revert back to the previous version of Android (Kitkat) after I updated to Lollipop?

because after the update to Lollipop I encountered problem in the battery life not even rest one day,

I want to return to Kitkat 4.4.4.

NB: I unlock the bootloader

Thank you

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