[Update BIOS]
Update image steps via webui:

step1:
login obmc webui by https, please input default user name "root" and password "0penBmc".
mention: please follow the sticker on the motherboard for the factory default password.

step2:
switch page to Operations->Firmware and then upload BIOS image tar file.

step3:
press "Start update" button and wait bmcweb refresh message.


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