1. You may have noticed things look a little different around here - we've switched to a new platform (XenForo) and have some new forum styles and features. This how-to guide will help you find your way around. If you find anything that looks strange, post it in this thread.

Dell XPS 15z (L511z) BIOS modding (UEFI booting, Nvidia GFX replacement, Advanced Menus, Native Speedstep) and more!

Discussion in 'Dell XPS and Studio XPS' started by jkbuha, Sep 29, 2012.

  1. jkbuha

    jkbuha Notebook Enthusiast

    Reputations:
    30
    Joined:
    Sep 29, 2007
    Messages:
    48
    Hi all

    Some of you may know my work from other bios modding forums - we have been busy researching on how to open the full potential of the Dell XPS laptops. After lots of hard work we have finally unlocked most, if not all, of our Dell's excellent hardware potential.

    Initially I'll just be posting a few ROMs as a proof of concept. Once we get more requests - and importantly, feedback! - I'll start to add more configurable ROMs.

    For now, here is the latest Dell XPS 15z A11 ROM, fully unlocked with Nvidia GPU undervolted to 0.83V/0.85V and native speedstep enabled for anyone who runs OSX.

    CPU Support: All i3 series, i5 series and i7 series.

    Note: I've kept the Intel vbios same as stock for now for compatibility purposes.

    Get the file here: Dell XPS15z L511z BIOS A12

    When I'm given more quota to upload a 2MB file to this form I'll post it here ;)

    Flash the file in windows with the following command line:
    winflash.exe /BIOS /EC /SA /SV /CVAR /BBL file.WPH

    With gaming the temperature drops with the new bios because the GPU is undervolted. There's a brilliant thread by captainkasar on the L502x that explains this in more depth (he's using the same mods) so if you use it more for windows and gaming I'd strongly advise you to check out his thread. There's a bug in the nvidiainspector that shows 0.98V but its actually running at 0.85V (I know because I set those limits in the BIOS GPU)

    DISCLAIMER: This file is for the Dell 15z only! Even though this flash is a safe process for this hardware, there is no (known) recovery method for Dell UEFI bioses yet and so I do not take any responsibility for improper use of this file!

    Respect goes out to Mikhail, captainkasar, djjonastybe, kasar, androdev and Ahmed - thank you for the great work done so far! Let's unlock all the potential of our Dell machines!

    Cheers
    jkbuha
     
    capitankasar likes this.
  2. capitankasar

    capitankasar Notebook Deity

    Reputations:
    231
    Joined:
    May 24, 2011
    Messages:
    1,667
    nice work!
     
  3. Atook

    Atook Notebook Consultant

    Reputations:
    75
    Joined:
    Jun 7, 2006
    Messages:
    271
    A couple questions:

    Does winflash work in Windows 8?

    Do you see any improved battery life in windows with the undervolted GPU?

    Thanks for your work on this, I'm glad to see an active community still thriving for the 15Z!
     
  4. jkbuha

    jkbuha Notebook Enthusiast

    Reputations:
    30
    Joined:
    Sep 29, 2007
    Messages:
    48
    Yes to both questions. At 0.83V win8 runs faster especially on GPU intensive operations. Cant wait to find a way to undervolt both the i7 and the intel hd3000 as well ;)
     
  5. fawar

    fawar Newbie

    Reputations:
    0
    Joined:
    Aug 27, 2012
    Messages:
    7
    if i have a 15z, but with i5 2410
    would these work and what do they do actually? I'm quite interested but i don't know what i'm getting too? XD
     
  6. jkbuha

    jkbuha Notebook Enthusiast

    Reputations:
    30
    Joined:
    Sep 29, 2007
    Messages:
    48
    I guess if you're asking those questions it's probably better if you don't flash this bios. They're quite advanced and let you do specific things like change memory timings, graphics processor priorities etc, but apply a wrong setting and you may be stuck in boot. Once we've found the way to flash recovery bioses (which actually is gathering momentum at the moment) it would be a better time to experiment with these bioses as it would then allow you to completely recover from any issues.
     
  7. fawar

    fawar Newbie

    Reputations:
    0
    Joined:
    Aug 27, 2012
    Messages:
    7
    Ohh i though you had come with some ''default modded settings of those bios'' that would be working on every 15z.

    The fact that you have achieve to bring the 525m to a 540m was pretty interesting too + the battery life aspect.
     
  8. conscriptvirus

    conscriptvirus Notebook Evangelist

    Reputations:
    89
    Joined:
    Mar 17, 2008
    Messages:
    331
    will you be modding other dell laptops bios?
     
  9. jkbuha

    jkbuha Notebook Enthusiast

    Reputations:
    30
    Joined:
    Sep 29, 2007
    Messages:
    48
    Depends what dell laptops. A lot of good work has been done on bios-mods forums, so feel free to look around and see if someone has already modded your bios. Otherwise feel free to ask.
     
  10. conscriptvirus

    conscriptvirus Notebook Evangelist

    Reputations:
    89
    Joined:
    Mar 17, 2008
    Messages:
    331
    Ive been trying to mod the XPS 15 (L501x) bios. I am able to change the voltages of the video cards and I have a bios from kizwan that unlocks additional menus. Some things I want to try but haven't been able to do/don't know how/not sure if is necessary:

    +change video card (GT 420m to 435m or 525m or 540m) (they're all the same chip basically).
    +update cpu microcode
    +anything else that can enhance cpu performance.
     
Similar Threads: Dell (L511z)
Forum Title Date
Dell XPS and Studio XPS Dell XPS 15z (L511Z) 1080p upgrade Feb 3, 2012
Dell XPS and Studio XPS Dell XPS 15z (L511z) Battery Issue Nov 1, 2011
Dell XPS and Studio XPS URGENT (Update!) Dell offering XPS 15z (L511z) as replacement for m1530! Aug 15, 2011
Dell XPS and Studio XPS Dell Signature Edition and Dell Drivers and Updates Mar 30, 2015
Dell XPS and Studio XPS Dell XPS 13 vs. Macbook Pro Retina 13" Mar 27, 2015

Share This Page