Thanks for your answers. In fact, the system is running well, the problem is that we must upgrade AIX from 5.2 to 5.3 for anew software, the migration procedure says that it is important to update the firmware. With command line, the system firmware up date just reboot, no change in firmware version. The only thing I saw is an error when rebooting, but I suppose there is no relationship with the firm ware update.