Here: http://www.intel.com/support/motherboards/server/s5520ur/sb/CS-030023.htm
you can find the link: http://download.intel.com/support/motherboards/server/s5520ur/sb/e44031006_s5520ur_s5520urt_tps_r14.pdf
to get the s5520ur_s5520urt_tps (Technical Product Specifications)
where you can read (among other useful things):
6. Jumper Blocks.............................................................65
6.1 BIOS Defaults and Password Clear Usage Procedure....66
6.1.1 Restoring BIOS Defaults ..........................................66
6.1.2 Clearing the Password .............................................67
6.2 Integrated BMC Force Update Procedure .....................67
6.3 BIOS Recovery Jumper...............................................68
6.2 Integrated BMC Force Update Procedure
When performing the standard Integrated BMC firmware update procedure,
the update utility places the Integrated BMC into an update mode,
allowing the firmware to load safely onto the flash device.
In the unlikely event that the Integrated BMC firmware update process fails
due to the Integrated BMC not being in the proper update state,
the server board provides a BMC Force Update jumper (J1H2),
which forces the Integrated BMC into the proper update state.
The following procedure should be followed in the event
the standard Integrated BMC firmware update process fails
or if the Integrated BMC becomes corrupted in such a way as to prevent the system from booting.
thanks !!
BMC force update procedure solve my problem.
now the system is ok.
