Unable to resume system update, or retrieve progress.

Hi,

From our OME 1.3 and to a CentOS 6.5 (in a M620), I was hit by the bug described in 2012 about the ssh key stored in a bad place or in a bad manner, and I was able to cope with it using the deploy trick.

Now the communication between OME and this server is OK, I can see in the /var/log/secure that ssh connection are OK.

I'm trying to apply a BIOS update, and though the package download is succesful, the apply part  seems stalled, saying :

"Unable to resume system update, or retrieve progress."

Next message is in french, sorry, I don't know how to translate it correctly :

"No update condition may be given when simultaneous attempt of software upgrade is run on the same server" or something.

I have absolutely no idea where to look at or how to debug.

Best regards.