I restarted and now it goes directly inside the boot menu with the following choices :
- Boot FileVault Prebooter from Preboot
- Boot macOs Install Prebooter from Preboot
- Boot macOs from Mojave
- Boot Recovery from Recovery
If I choose "Boot FileVault Prebooter from Preboot", there's a black screen with an apple and nothing happens.
If I choose "Boot macOs Install Prebooter from Preboot", there's shortly a black screen with an apple and right after a "no entry panel" logo.
If I choose "Boot macOs from Mojave", If I choose "Boot FileVault Prebooter from Preboot", there's a black screen with an apple and nothing happens.
So I can't access to the EFI to put the "-1"