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Intel SE7520AF2 BMC controller not responding after update

I'm working on an Intel SC5300 server with SE7520AF2 board. The BMC firmware was updated incorrectly as baseboard, when the board is in fact an LX model (per Intel and vendor). Boot sequence is halted with an error of "84F2 Baseboard Management Controller failed to respond - press F1 to resume, F2 to enter setup". I have reflashed bios, cleared bios via jumper, still no success. Front panel controls are disabled, and when trying to update fru/sdr firmware I get a pause followed by BMC controller not responding. What are my options here, I am open to input.

Bob
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Papabull

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Okay, I'll bump it up to 500 points
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You loaded an incompatible O/S in NVRAM.  Pretty much all devices have a mechanism to re-bootstrap, but that sometimes requires making a special cable, messing with undocumented commands and RS-232 .. a big job.   If Intel says there is no way to force a firmware update outside of a lab, then sorry, you'll have to get another BMC card.
Well I understand your position, I just have not gotten any answer for this issue - special cable or rs232 commands included. Intel is not saying anything, that is my problem. I would not have a problem getting a management card, if that was the case but the firmware I am talking about is onboard. If installing an IMM will take over for the mBMC on the board, I will be happy to do so. Just did not want to muddy the water on the onboard mBMC by installing an advanced management card, which may or not solve the issue.
That is a fair question.  the deal is that an external BMC will work, but there has to be compatibility and a connection to either i2C or IPMI port between the external card and the connector on motherboard.  

So the question to ask intel (because lots of variables, and motherboard/bmc specific) ... is to see what BMC card they support for that motherboard, and because your embedded BMC is fried, will it work?

Gut feeling is it will work just fine.
I am going to try to get Intel's view on this. It may be a bit before I get back to this question so please be patient, am going to locate an IMM for this board in case it is the path I take - if so, the points will be all yours.
Well, tried IMM and board won't boot with it installed.... pulled it and I can boot. The information I need is a switch, probably undocumented, for frusdr.exe to force an update to the correct board model. I think the update to incorrect baseboard model just wiped out the fru and sdr information - in fact in bios the system info page shows n/a's for all bmc information. I would bet that the switch, or another piece of  software exists to do this, because this chip has to be programmed to function according to whatever board it is installed in and it makes sense to do it once installed on the board instead of before being soldered on the board.
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David
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I did not really learn anything here that I did not already know; the manufacturer (or a replacement part) is always an option. I appreciate the time you put in answering this, but I always knew I might have to junk the board and replace - that is why I asked the question as I did.