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‎02-22-2026 01:26 AM

HP Recommended

The boot error ‘MPM / Product information not valid’ and lines such as ‘System Board (00A) – ... missing or invalid’ is presented during the startup/boot  as the system board's machine-unique identity (DMI/SMBIOS) does not match what the computer expects,  this caused after a malfunction BIOS/firmware update.

It is possible to program  the exact correct DMI fields in the BIOS menu Main → Set Machine Unique Data when the motherboard is in MPM Unlock (Manufacturing Programming Mode).


Below field should be filled with device-specific strings
Feature Byte: a shift-sensitive configuration string; incorrect characters will cause the BIOS to fail validation.

Based on the product number this is what I am able to collect from HP official websites.

IMG_DESC1 3Q3X476J6S6Z6b7J7M7Q7W7m7saBapaqauawbhcA
IMG_DESC2 dUdpdqgd.nF


But that is NOT the correct Feature Byte string

 

Strict validation applies to the HP ProBook 450 G4:

A valid Feature Byte must be:
Exactly 20 characters
Hexadecimal only: 0–9 and A–F
UPPERCASE only
No dots, no lowercase letters, no other letters
I have open the computer and could not find this information on any label based on other supporting information collected.

 

How to resolve this ??

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