Ok, so :

Installation of Bootloader 5.5128 ok
I downloaded navcore 8562, deleted all files from SD card, copied everything of navcore 8562 to SD card.
Installed map again and activated it with Fastactivate

Everything went fine apparently but now GPS keep turning on with a picture of a Citroen car then turn on Welcome to TomTom ONE XL then keep shutting down.

Did i do something wrong somewhere ??