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HP Elitedesk 800 G4 SFF BIOS/EC firmware error (Code 5.2) - Fixable?

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  • surcharge6650
    New Member
    • Dec 2025
    • 6
    • Germany
    #1

    HP Elitedesk 800 G4 SFF BIOS/EC firmware error (Code 5.2) - Fixable?

    Hello guys,

    I stupidly tried to read out my BIOS & EC flash (with a clamp). This didn't work, I only read FF's. But after this operation, the PC is not longer turning on, just beeps 5 times (and blinks red) then 2 times (blinks white). The manual says this is the error code for: "The embedded controller cannot find valid firmware.".
    I think it locked itself because of my experiment. Is this fixable? I now removed both chips from the board and dumped them, I attach the files in this post hoping someone can help me fix my stupid error. Thanks so much in advance anyone who is reading this. Here is my serial and model number:
    • HP EliteDesk 800 G4 SFF
    • SP# L22110-601
    • PGTXL0GCYC12O4
    • S/N on the casing: CZC912B82Y
    Thanks again to anyone reading this, I'm hoping someone knowledgeable is able and willing to help me out with this.
    Attached Files

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    Last edited by surcharge6650; 12-11-2025, 09:56 AM.
    Tags: bios, bios dump, elitedesk, embedded controller, hp bios
    • hoaca388
      Badcaps
      • Jan 2022
      • 12664
      • Socialist Republic of Vietnam
      #2
      Originally posted by surcharge6650
      Hello guys,

      I stupidly tried to read out my BIOS & EC flash (with a clamp). This didn't work, I only read FF's. But after this operation, the PC is not longer turning on, just beeps 5 times (and blinks red) then 2 times (blinks white). The manual says this is the error code for: "The embedded controller cannot find valid firmware.".
      I think it locked itself because of my experiment. Is this fixable? I now removed both chips from the board and dumped them, I attach the files in this post hoping someone can help me fix my stupid error. Thanks so much in advance anyone who is reading this. Here is my serial and model number:
      • HP EliteDesk 800 G4 SFF
      • SP# L22110-601
      • PGTXL0GCYC12O4
      • S/N on the casing: CZC912B82Y
      Thanks again to anyone reading this, I'm hoping someone knowledgeable is able and willing to help me out with this.
      HP EliteDesk 800 G4 Base Model Small Form Factor PC

      Attached Files

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        Comment

        • surcharge6650
          New Member
          • Dec 2025
          • 6
          • Germany
          #3
          Originally posted by hoaca388
          HP EliteDesk 800 G4 Base Model Small Form Factor PC
          Thanks a lot for your answer! This is just the BIOS file, correct? I do not have to flash the EC firmware?
          Thanks again, I'm hoping this fixes it, I just wanted to make sure because I have to resolder everything so I want to make sure I'm not missing anything.

            Comment

            • surcharge6650
              New Member
              • Dec 2025
              • 6
              • Germany
              #4
              Originally posted by hoaca388
              HP EliteDesk 800 G4 Base Model Small Form Factor PC
              Sadly, this didn't fix it. It first booted with error 5.7, which isn't even in the manual. I discovered I didn't solder the EC memory on correctly, after fixing this the old error code (5.2) came back. Any other ideas? Thanks for your help!

                Comment

                • surcharge6650
                  New Member
                  • Dec 2025
                  • 6
                  • Germany
                  #5
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