[TUTORIAL] XPS 15 9550/9550 BIOS Advanced Options

Discussion in 'Dell XPS and Studio XPS' started by tiger501, Oct 30, 2017.

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  1. kido dee

    kido dee Newbie

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    Any version before 1.5.1 is fine ... can be even 1.2.x , i don´t mind... as long as is a previous version, i am happy, thanks again!
     
  2. tiger501

    tiger501 Newbie

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    I dont think anybody has .rom file of older BIOS.even if someone has,there could be chance of bricking your Laptop.
    There is an option in BIOS to allow dogwngrading bios version.Did you check that?
     
  3. kido dee

    kido dee Newbie

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    Hi ,

    in the XPS 9550 2016/2017 is not possible to flash a "ROM" file anymore ,or at least not this extension . If you got stucked in the BIOS 1.6.1 ,no worries, you can downgrade to any BIOS version ,check carefully this tutorial ,it´s really simple and easy : https://github.com/wmchris/DellXPS15-9550-OSX/blob/10.13/Additional/bios_upgrade.md

    For the XPS 9550 2016 model , in my case , the perfect BIOS that works really smooth and all the Intel technologies are working fine is the BIOS version 1.5.1 .
    To find old BIOS it´s easy , just google "XPS 9550 BIOS 1.4.0" or "xps 9550 BIOS 1.2.25" , depending on the version you are looking for .
    Thanks to that tutorial now is possible to downgrade to any BIOS you like ,check which fits you more ,but for Windows 10 users i recommend 1.5.1 , is more stable and works really fine . I know is a pain in di ars all this, i searched everywhere... not even on the Dell website is coming the solution.... i am wondering how this guy knew about this solution...or maybe is an old method and i didn´t know...anyway, the point is that if 1.6.1 gives you problems, go back to 1.5.1 . 1.4.0 i saw it a bit faster in the start up , and 1.2.25 a bit faster too, but it might not go too smooth with Windows 10, so if you wanna avoid black screens and blue screens and all this, better go for 1.5.1 that is really stable . If you guys need to ask more questions, i am here to reply anytime. Cheers and good luck with your XPS 9550 ,enjoy it !
     
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  4. kido dee

    kido dee Newbie

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    So if the normal updating is not working, follow these steps :
    1. Create USB Recovery Stick
    Format USB stick as FAT32, place Firmware Update EXE file on the root of the stick and name it BIOS_IMG.rcv

    2. Goto Recovery Boot
    ensure that the laptop's battery is charged up to at least 10%. Verify that the laptop is powered OFF and disconnect the AC adapter.

    Insert USB Stick,press and hold the CTRL + ESC keys on the keyboard, then plug in the AC adapter to the laptop.

    Release the CTRL + ESC key on the keyboard once you see the BIOS recovery screen.
    On the BIOS Recovery screen, select Reset NVRAM(if available) and press the Enter key. Select Disabled and press the Enter key if you wish to save the current BIOS settings.

    Select Recover BIOS and press the Enter key to start the recovery process.
     
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  5. -=xXx=-

    -=xXx=- Newbie

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    Hi...
    During update of the bios there was a glitch and now during the boot laptop stucks on dell logo, when I plug the power it turns on even without me pressing power button, the battery is dead so when I press Ctrl+Esc and go to bios recovery mode it doesn't let be flash bios. when I remove the battery it goes to diagnostic mode all tests pass succesfully except battery when rebooted it stuucks on dell logo.
    And I don't know why it got's really hot, fans doen't turn on, but during the diagnostic they worked. I'm thinking that there is problem with bios and want to flash it through SPI programmer but can't find dump anywhere maybe someone can share his so I can try to flash it on my chip.

    Thanks.
     
  6. GoNz0

    GoNz0 Notebook Prophet

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    Have you tried holding the power button for 30 seconds to initiate BIOS recovery?
     
  7. -=xXx=-

    -=xXx=- Newbie

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    Yes I done it, strange thing that it doesn't react to power button at all even in diagnostic mode I can hold it forever and it never powers off...
     
  8. -=xXx=-

    -=xXx=- Newbie

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    So basically I need a full bios dump, it this wouldn't help then there is hardware problem.
     
  9. selfassembled

    selfassembled Notebook Enthusiast

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    Has anyone tried other variables? Or done this with the 9360? I want to try overclocking the LPDDR3 from 2133 to 2400 when I enable speedshift. Anyone foresee problems besides possible instability?

    SpeedShift
    setup_var 0x4AD 0x1

    Overclock RAM
    setup_var 0x412 0x960

    these are some settings available for memory frequency

    0x40318 End If {29 02}
    0x4031A Suppress If: {0A 82}
    0x4031C Variable 0x412 equals 0x2 {12 06 12 04 02 00}
    0x40322 Option: 2133, Value: 0x855 {09 08 68 05 01 01 55 08}
    0x4032A End If {29 02}
    0x4032C Suppress If: {0A 82}
    0x4032E Variable 0x412 equals 0x1 {12 06 12 04 01 00}
    0x40334 Option: 2200, Value: 0x898 {09 08 69 05 01 01 98 08}
    0x4033C End If {29 02}
    0x4033E Option: 2400, Value: 0x960 {09 08 6A 05 01 01 60 09}
    0x40346 Suppress If: {0A 82}
    0x40348 Variable 0x412 equals 0x1 {12 06 12 04 01 00}
    0x4034E Option: 2600, Value: 0xA28 {09 08 6B 05 01 01 28 0A}

    Also I want to mention that the Suppress If: {0A 82} line appears before every advanced menu setting, and if that could be changed, then we could modify any variable we wanted from within the bios, as the options would no longer be suppressed.
     
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  10. CB722

    CB722 Newbie

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    Would it be possible to undervolt the gtx 960M using this? Does anyone know the values?
     
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