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Manufacturing program mode set

HP elitebook 850 G1



It is a secondhand notebook which is completely whipped. However by removing the BIOS password by the first owner, something happend to the bios so the laptop can't booted anymore. 

Unfortunately I can't find a serialnumber somewhere on or in the laptop so I guess it is removed.


As soon as I poweron the laptop I get: 

  Manufacturing Program Mode Set 2 of 10


 Press the ESC key for Startup Menu


The escape key doesn't do anything.  After a few seconds I get the message: 

  Product Information not valid

and the page contains the error code


All further info is blanc.  I should type ENTER to continue.

ENTER or just waiting brings only the screen:

  BIOS Identity Data Manual Recovery


  Embedded Controller has identified a problem configuration data and Recovery Policy is Manual


After that it stops and I don't know how to solve this.


I already made a BIOS recovery USB stick and pushed  Windows and shift-B  and powered on. The same with Windows and b

I get a black screen and nothing happens. 


I have a second identical laptop from the same stock and that works fine.  


What can I do?


Thanks in advance.







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