[6.9.0] Won't boot after 6.8.3 to 6.9.0 update

Hi, I have a little problem with the last update.

I use the Update Assistant to be sure...

I updated from 6.8.3 to 6.9 and my server was restarting in a loop

/bzimage...ok
/bzroot...ok

and reboot non stop.

Any idea ?

Thank,