Modding/Flashing of a Dell G5 15 5590 BIOS

BIOS/UEFI Modding BIOS Modding Guides and Problems
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(“Compilation”) Dell G5 15 5590 - i7-9750H - GTX1650M - VULCAN15_N18E

Target = flashing modded Bios

  • “unsuppress” hidden Menus

  • ReBar / adding DXE driver/modules - update Driver

  • GPU TDP “increasing” *Vbios/Shunt mod* (customized Cooling/Heatsink)

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Working :

  • unlock Bios ( Cvar_Settings for Undervolting, etc )
  • read/write SPI regions (except EC)
  • activate “4G Above” for ReBar

NOT working so far (28.12.25) :

- modified biosreg file with inserted DXE module results in NO DISPLAY after reboot !
Link to thread regarding ReBar Issue

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Current Steps/Issues :

  • FPF Verified Boot / Boot Guard IBB / protected regions/volumes /mod. effect..
  • “checking/verifying” inserted_biosreg.zip (5.1 MB) - DXE module (noPatch)
  • “bypass - effect” when using CH341a Programmer vs Internal flashing

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Files related to Board: VULCAN15_N18E - (Chip: GD25B127DSIG):

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Cvar_List :

CFG Lock : 0x5C4 0x0
BIOS Lock : 0xA1E 0x0
Overclocking Lock : 0x660 0x0
Flash Protection Range Registers (FPRR) : 0x10D8 0x0
Me FW Image Re-Flash : 0x7C6 0x1

OverClocking Feature : 0x72 0x1

C-States : 0x595
Above 4G : 0x8EC
Intel Bios Guard : 0x1191

Kill TPM: 0x1393 Disabled/ Enabled
TPM State: 0x10EF Disabled/ Enabled
TPM Owner Status: Owned 0x1/UnOwned 0x0
TPM Device: 0x7C3 dTPM 0x0/PTT 0x1
TPM 1.2 Deactivate: 0x36C Disabled 0x0/Enabled 0x1
TPM Support in BIOS: 0x10F4 Disable 0x0/Enable 0x1
Device Select: 0x1101/TPM 1.2 0x0/TPM 2.0: 0x1/Auto: 0x2
Intel Trusted Execution Technology: 0x642 Disabled/Enabled

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Links :

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Tools :

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*unsorted_Stuff* :

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*original_Post*****

Hey, sorry for beeing “another” clueless one having the idea to do some fun stuff with… this stuff … :smirking_face:

Please dont get my request wrong, i am sure everything i need can be found here already and i have highest respect to all the people putting alot of time in writing all this Infos/Guides and helping so many people with their issues.

I try to find all the stuff and tools i need, but i absolutely will be glad if someone have a bit time and can guide me in the right direction. In the meantime i try to do small tiny steps, and no errors..

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Back in my days, bios was just a file on a chip and not embedded with other stuff and protected like hell, so all this is a new thing to do for me.

I can extract a bios an read tu Uefi Protocol to find some VarStoreInfos.

What brings me “here” was that i just quick wanted to add ResizeBar to my GPU.

But i couldnt figure out or manage to flash anything. Reading the infos i could find let it seem quit a huge Task to manage until the point where it would even be possible.

For me, i cant even really define where i should start, have 30 Tabs with Stuff and guides and it is just too much to get an idea, what is the guideline i should follow, what is not outdated, what is related to my task, what is leading elsewhere and exclude steps i have to follow… you get me what i want to say…

Every Input is highly appreciated :wink:

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This takes time… your time, you really cant expect users to lose their own time on this, you’ll have to read and learn a bit sir, this is not a simple request or an easy task to perform based on remote posts of a forum with no base knowledge from the user itself.

And this is a branded laptop system board/bios… not so easy compared to a retail desktop motherboard, so many of your goals cant be confirmed in a “snap of a finger” and will require tests on your part, this evolves the use of a programmer and several try outs.

2 Likes
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@healdealer84
I totally confirm, what MeatWar has written. For users, who have no knowledge about how to modify a BIOS and how to get a modded BIOS properly flashed, the chances are extremely high, that they get finally a bricked PC/laptop.
Here are the links to some Guides:
>BIOS Modding: Introduction and Preparations<
>[Guide] Manual AMI UEFI BIOS Modding<
>[Guide] HowTo flash a modded AMI UEFI BIOS< (only partly usable for a Dell BIOS)

Good luck!

1 Like
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@MeatWar @Fernando

thanks for the fast replies :upside_down_face:

i absolutely understand, that this is nothing anyone wants to waste their time with. Thats why i already explained i dont expect much, like i said everything is here somewhere, already written down. hope its ok to let this post open,
even its just for me to keep track of my stuff, addink forum links and results, is it ok if i edit this Post with my progress and stuff ?

maybe it will help someone one day :exploding_head:

1 Like