Default Huawei G520-0000 problems

Hello all,

I have a Huawei G520-0000 bought from China and tried to follow this guide :

I successfully rooted the device but when I tried to copy the following files :
OneTime Initializer.apk
Google Services Framework.apk
Setup Wizard.apk

in root\system\apps and then rebooted, android is now completely bugged.
I'm stuck at the "Welcome" screen and whenever I try to do something else, I have the folowing error "The Setup wizard has stopped" (My device is in french so sorry if it's not completely accurate).

I cannot start in recovery mode and I cannot modify the debug USB option...

Any ideas about what should be the next step ?

Thanks !