M4800 Owner's Thread

Discussion in 'Dell Latitude, Vostro, and Precision' started by changt34x, Oct 29, 2013.

  1. aglowacki

    aglowacki Newbie

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    When flashing a message appears: "BIOS upgrade blocked due to unsupported downgrade"
     
  2. hodgeMN

    hodgeMN Notebook Evangelist

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    It appears the LP156FW4 (SP) (L1) screen is not compatible with the Dell m4800. I ran into the same issues. When I tried the LP156FW4 (SP) (L1) in the laptop that had the original 1080p screen, it would not work either.
     
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  3. Aaron44126

    Aaron44126 Notebook Prophet

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    Check the release notes on the web site (for new BIOS, I think). You should be able to downgrade but you will have to do it in steps.
     
  4. hodgeMN

    hodgeMN Notebook Evangelist

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    I ran a few more tests. I could only get the LP156FW4 (SP) (L1) version to work in the original m4800 with the original 1080P screen if I disabled the switchable graphics option in the bios. The LP156FW4 (SP) (L1) will not work with switchable graphics while the original panel that Dell shipped with the m4800 - LP156WF6(SP)(B1) - will.
     
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  5. hodgeMN

    hodgeMN Notebook Evangelist

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    It seems the LP156WF6(SP)(B1) is in short supply. I took a chance and ordered one from Amazon marketplace. The description indicates its a LP156WF6(SP)(B1) and not a compatible panel like so many of the ebay listings seem to indicate. I will post an update when it arrives.
     
    Last edited: Dec 28, 2015
  6. aglowacki

    aglowacki Newbie

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    I was only able to downgrade to A13. Next available downgrade on DELL site is A09 and its fails.
     
  7. Aaron44126

    Aaron44126 Notebook Prophet

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  8. alexhawker

    alexhawker Spent Gladiator

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    Try this site.
     
  9. aglowacki

    aglowacki Newbie

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    I managed to downgrade to A11. Tried A9 and A6 but both failed with message "BIOS upgrade blocked due to unsupported downgrade"
     
  10. M.J.S.

    M.J.S. Notebook Consultant

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    Still having A10 on my disk… I don’t think I’m allowed to “distribute” it, though.

    However, I can provide this:
    File: M4800A10.exe
    CRC-32: 538fba6a
    MD4: 101a69c62252a0f25a414f9230fb641d
    MD5: 6ae0f97802d1c48e058e95165ecf8d2a
    SHA-1: ab515b824f0c5168e15347440a492897808c1841

    In case you could find it anywhere… Yet I googled a little with no luck. :(
     
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