If you are still on Android 4.4 KitKat, you can update to the latest supported version (5.1.1) using these steps: Huawei P7 Lollipop 5.1.1 update hands-on (download update)
There is released by Huawei for the Ascend P7-L10. The final official software version for this model is Android 5.1.1 Lollipop with EMUI 3.1. huawei p7 l10 update marshmallow 6.0.1 download
Since Huawei did not release an official build, the only way to run Android 6.0.1 on a P7-L10 is through . If you are still on Android 4
Alternatively, you can use the HiSuite software to update your Huawei P7 L10: huawei p7 l10 update marshmallow 6.0.1 download