Howto: Downgrade BIOS (Dell Venue 8 Pro) from A04 to A03

Discussion in 'Dell' started by Screeny, Jan 30, 2014.

  1. Screeny

    Screeny Pen Pal - Newbie

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    Hi there,

    I found a solution for downgrading the Dell Venue 8 Pro BIOS from A04 to A03.
    A04 disables some expert settings - so there was a need to downgrade. If you just use the normal installer you will get a "downgrading isn't supported message". But - what a luck - the user hyperfrog found a solution by using a hex editor. I tried it for myself - everything is working :)

    Short description:
    So you can modify the BIOS by yourself or use this - already patched - file: https://mega.co.nz/#!OhBT3JaD!ahwF-_QsB-bxnEnamGvRL3NdOI_yAzbn1DKsx_h0q4E

    Source: Venue 8 PRO BIOS A04 - Windows Mobile Products - Mobile Devices - Dell Community

    Greetings
    Screeny :hi2:
     
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  2. saniko

    saniko Pen Pal - Newbie

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    Wish there was an advanced version of the Dell Venue 11 Pro bios. I hate having a Sandisk Extreme Ultra at 15mb/s instead of 60!!!

    Nice find!
     
  3. slice2011

    slice2011 Pen Pal - Newbie

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    Did this a couple weeks ago as I updated to a04 before knowing about the tweaks you can do on a03. Did the hex way took 3 minuets with 0 issues. Thanks for sharing the actual file so others can :thumbsup:
     
  4. imperix

    imperix Pen Pal - Newbie

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    I don´t know why it doesn´t work for me. I´ve already installed the mod BIOS but i can´t access the BIOS settings. Any Suggestions?
     
  5. Screeny

    Screeny Pen Pal - Newbie

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    Hi,

    you have to start the bios by choosing "efi settings" from inside of windows :)

    Greetings
    Screeny
     
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  6. V3D

    V3D Scribbler - Standard Member

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    What I am more interested in is modifying A04 to regain access to the advanced settings.
     
  7. imperix

    imperix Pen Pal - Newbie

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    Sorry, but i don´t know what is that "blue screen"(7 step). When I restart the tablet (6 step) it restart normaly.


    1) Swipe in from the right for the charms bar
    2) Select Settings
    3) Change PC Settings
    4) Select Update & Recovery
    5) Select Recovery (3rd option on the far left)
    6) Under Advanced Startup press the button that says restart now
    7) Wait for tablet to reboot
    8) At blue screen Select 2nd Option, Troubleshoot
    9) Select advanced options
    10) Select UEFI Firmware Settings
    11) Select restart (shows "restart to change UEFI firmware settings)
    12) You're in a weird BIOS mode now, begin by pressing the Esc button at the top right
    13) Choose Advanced (2nd option)
    14) Choose LPSS & SCC Configuration
    15) Change SCC emmC 4.5 HS200 Support to 'Enabled'
    16) Change SCC eMMC 4.5 DDR50 Support to 'Disabled'
    **NOTE** if you want to increase your micro SD speeds at this point
    **16.1) Change DDR50 Support for SDCard to 'Enabled'
    **16.2) Change SDR25 Support for SDCard to 'Disabled'
    ************************************************** *************************
    17) Hit Esc at the top right corner twice (you should be at the main menu)
    18) Select Save & Exit (Last Option)
    19) Select Save Changes & Exit (First Option)
    20) It asks you to confirm you want to save and exit, select yes and the tablet will reboot
     
    Last edited: Feb 9, 2014
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  8. Screeny

    Screeny Pen Pal - Newbie

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    The blue screen appears if you choose the right option mentioned in step 6. The tablet does not reboot completly, it's more like a "soft reboot".
    Bu don't worry, you can boot into the "blue menu" by cmd too :)

    Just execute this command in a privileged cmd: shutdown /r /o /t 00
    After that you are in the "blue screen" and you can continue with step 8

    Greetings
    Screeny
     
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  9. fastcarr

    fastcarr Pen Pal - Newbie

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    Or turn off the tablet and power on by holding the volume rocker down while pressing the power button. This will boot you into the BIOS.

    Skip down to step 13.
     
  10. Screeny

    Screeny Pen Pal - Newbie

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    Not sure if this is working. As far as I know the "secret" UEFI options are only visible if you start UEFI out of windows.
     
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