Why so many crashes after last update?

[AC Question]

Hi everyone, a few days ago i updated my telephone (Huawei Ascend P7) thinking was another routine update, but after installing it my phone did not work correctly anymore. ALL the app crash after a few second i click them, continuous lag and the battery is not charging all the time. i was researching on internet if there is some solutions but the only one was to recovery the system but it did not worked, so now my Huawei is Empty and unaviable.

 

[B. Diddy]

Welcome to Android Central! Try booting into Recovery Mode and wiping the cache partition, which won't erase any personal data. Follow the steps in this video, but instead of selecting Wipe Data/Factory Reset, make sure you select Wipe Cache Partition. When complete, then select Reboot System Now. Sorry that the video isn't in English--hopefully you can see the button press combination he's doing.

https://www.youtube.com/watch?v=FIhCtOuGe4I