(UEFI) Dell XPS 15z L511z modded BIOS - and HOWTO

[humanitybg]

Hey guys, what happened with GT540/550 upgrade? And kasar, did you manage to do the overvolt thing you posted a while ago? =)

http://forum.notebookreview.com/dell-xps...-more.html

Shortly:
- Hard to find nVidia Optimus-compatible updated roms
- Altering voltage table was a piece of cake ... but results weren't that great

Wow, thanks for the fast response but I doubt the L502X bioses are going to be compatible with my L502z, or am I mistaken? I'm also running the modded A12 from the OP right now =)

[TimeWalker]

Ught, I see .. THEY ARE NOT compatible indeed.
No point in having the voltage table altered, really .. the hard coded values for respective 2/3D clocks are there for a reason.
Basically undervolting gives more stability and less heat, overvolting on the other hand leads to stability issues and more heat generated... like a lot of stability issues.

[TimeWalker]

Actually you wanna know a funny thing? Remember how MEInfoWin says there's no GbE region on this HM67 chipset?
That region after FD 00001000h - 00037FFFh which is 220 Kb .. it basically has the same header as ME v8 firmware .. not quite but similar.


So being in between FD and ME I guess these 220Kb can be used for ME region of the firmware ..
And funny enough if you take the v8 firmware from lenovo which is 17CFFFh bytes and subtract the size of ME v7 which is 145FFFh you get what ? 37000h ?
Any guesses ? Yeah correct .. that our *mystery region* in between FD and ME.

Ba dum tss:

00000000h - 00000FFFh: Flash Descriptor Region
00001000h - 00037FFFh: Extends ME
00038000h - 0017FFFFh: ME Region
00180000h - 003FFFFFh: BIOS Region

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I guess even modifying the PFlash.efi won't work as these regions are just plain locked.. there's no host access to them even if it's the all mighty flasher.
So the only way to unlock is using the hardware.. props to @kasar
So now we know that there's in fact free space to flash an entire v8 ME firmware onto the chip ...
What's left is getting the flasher to work .. then according to FPT readout we have the following locks:

Code:

Lock Settings. ======================= Host CPU master: 00 00 0B 0A ME region master: 00 00 0D 0C GBE region master: 18 01 08 08

So as pointed out earlier .. flashing 00 00 FF FF 00 00 FF FF 18 01 08 08 to 0x60 using a hardware flasher is the only way of unlocking this sucker.
There's no GbE apparently, so no point in unlocking it anyway ...

[kasar]

posting from another laptop

my l502x machine its fine,but still without reasembly.

I suceeded lifting the vcc leg and adding a switch to it.

by deactivating that switch, the computer was unable to show anything from the screen, and the delay to make the lights blink increased like 2 -3 seconds.

well I also even made another internal switch to cut power of the internal bluetooth mod.

however still no luck with the flasher, even by removing the vcc of the motherboard (I verified the weak bluetooth light disapeared)

anyway the only way to "detect" the chip "sometimes" with the software, it is by leaving the laptop turned on, and it is unstable.

I'm getting short of options plus its really annoying to have taking appart my whole main laptop constantly.

only solution I see is phisically desolder the chip and move it to the flasher, after hack it, move it back to the computer.

however I'm not that good soldering, and I'm like 70% sure if I try that, I will kill the compuer.

so all I can try is to short a little the wires and see if that help

well, another more viable option would be following

just flash the bytes required to change from the descriptor, leaving untouched the rest of the flash, even unstable, they are very little bytes to need to be changed, and probably would be able to get flashed into some small attemps, the bad thing of this software is that It seems to just allow complete flashes

any ideas?

[TimeWalker]

I bet there are alternatives for LPT SPI flashers, will try look something up later. But I'm not sure that even with the lock removed it would allow to flash 2 *regions* with a new firmware.


This can be useful too:
http://write-code.blogspot.com/2012/08/p...0.html?m=1

Looks like you are missing a capacitor between vcc and gnd. Resistor nominals depend on the parrallel port impedance. Also there is an updated version of the softwarw from 2012

[kasar]

nevermind, just disoldered the chip and removed the flasher port from the motherboard, everything were failuring like that way.

I have now the chip In my hand, with some luck, I will be able to wire it direcly like the other guys did.

now , it is all or nothing ^^

---

I'm building this now

[TimeWalker]

Wishing the best of luck to you, pal!

Sent from my LG-P500 using Tapatalk 2

[kasar]

thx ^^

I am now dumping, aparently ok, lets compare the 3 different dumps now

---

woot, the dumps are identical!

I think I finally got it

---

ok, here is the complete backup, disolder the chip seemed the only way to get the backup ^^

http://www.mediafire.com/?p5bncm59yf5rez8


now I need to patch the file

I think it was mod this

00 00 0B 0A 00 00 0D 0C 18 01 08

to

00 00 FF FF 00 00 FF FF 18 01 08


right?
and then flash the file back

if this work and I sucesfully can attach back the chip to the motherboard I will have the first unlocked l502x I think ^^

else I will have a beautifull brick

[TimeWalker]

Nice! Yes, that's correct!
No, else you have a backup at hand but you would have to desolder and solder everything again which would be a bummer.
Like I said .. coin cell 3.3 and lifted up VCC leg and short wires should do the trick. And they did .. even without the capacitor.

Don't rush on flashing yet, I will compare your BIOS, ME and FD regions side by side to verify they are indeed properly dumped.
I will be doing this in like 10-15 minutes, please stay put.

Also, like I said there's no warranty it will allow you to use the intel's tool to flash both ME sectors of the firmware.. it may then say that there's not enough space. So it might e required to flash both of ME sectors with v8 ME firmware to fit it properly .. and I'm not sure if it will boot after that :|

[kasar]

ok, I was using sipigm under ms2 from a bootable usb stick in a old desktop.

for some reason spipgm was unable to write even a single bit.

but I managed to write the whole modified rom by using flashrom app


flashrom -p rayer_spi -w moddedfirmware.rom

ok, flashed, and then made another dump

everything succeded

now the hard part, pick the modded chip, and put it back to the motherboard

note: unlocking this has been a pain in the [censored], so I guess this is not a suitable method for all users.

too bad we cant relase some kind of patch or modded bios with this D:


edit:

oops, late , I already flashed >.<, didnt saw ur post


well, lets supose things went fine, I will put everything back at the laptop when you confirm.

let me know what you see from those dumps