Macbook pro won't start after update to Mojave I've just updated my 2012 MacBook Pro to macOS Mojave but it won't boot (the caps lock light won't turn on and off.)

So I've try to hold CMD+R during the boot but it asks me for a password, but I don't remember having set a password in the past. Does someone have a solution?
Also I want to know if the password box is in qwerty or azerty (normaly my mac is in azerty.)
I've solved my problem, I've simply deleted the content of the folder /Library/Extensions