Bios message: Management platform in manufacturing mode

A couple of days ago, I had a dead motherboard for a HP Z420 wich I sent into RMA and got another one.  The new motherboard booted fine but I got the following BIOS message:

Management platform (ME) in manufacturing mode

At first glance there are no other symptoms but after digging a bit, it keeps me from pushing Bios configuration settings automatically in windows using a config file wich I can do fine on all other machines.  I have to configure the Bios manually.  Also I found out that if I move the FDO jumper on the motherboard to flash the management engine hoping to fix this, I get the following error message:

error - global valid is not set, please power cycle the system.

I tried calling HP support, a technician even came on site to check it and he was not able to fix this.

2 days later, received another RMA motherboard for another Z420 (different PC) and the bios is also in this manufacturing mode.  Anyone knows how to fix this?
BenFontaineAsked:
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BenFontaineConnect With a Mentor Author Commented:
HP Asked me to create a RMA request form and they sent me another motherboard. By then it was too late to try Samwell's solution
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pony10usConnect With a Mentor Commented:
Try going into BIOS and pressing Alt+F to turn off manufacturing mode.
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SamwellCommented:
is there any update to this request?
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BenFontaineAuthor Commented:
Since I could'nt try pony10us's solution, I marked mine as the best solution.
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