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

[jkbuha]

Sure Florin. To dump the file, disassemble it or open it with a hex editor. You then need to look for a hex sequence with the pattern I updated in the first post. That string is the IFR SUPPRESS instruction (01 disables it). Have you found the string in the BIOS?

[TimeWalker]

The PTID is located in ACPI Configuration. I assume it drops one of SSDTs related to this device.
Also while enabling Thermal Sensor Device in Platform Thermal Configuration and booting to windows I saw this:

I wonder why the [censored] would DELL disable a chipset sensor? Just to stick with DTS/PTID instead?
Still playing around with temp stuff as we speak, I also would like to figure out the "passive cooling formula" stuff, what Tn and Tt mean... and whats delta performance...

There are still some options to be unlocked as pointed out by HairyCube .. There must be a way to completely disable HD graphics as well as Intel Management Engine. And like you said OC is missing and so does access to UEFI shell.

[Mohamed Khairy]

1) Dump your AdvancedSetup.efi module (IDA, objdump etc) and parse it through the IFR specification provided by UEFI

can you explain this step?

you are here
good luck on doing this

[Florin9doi]

My notebook has ami aptio and the hex sequence doesn't exist. I disassembled the file. What's the next step?

[kasar]

I was also able to unhide the thermal menu by using those hex codes ^^





so as for the moment all mods to the module are:

00 29 02 29 02 0A 82 45 8A 00

and

00 20 00 29 02 0A 82 45 8A 00

to 01 on the last 00 right?

[jkbuha]

yes that's correct kasar. It's actually all (29 02 0a 82 45 8a 00) to (01) in the last byte.

[jkbuha]

My notebook has ami aptio and the hex sequence doesn't exist. I disassembled the file. What's the next step?

Can you check for this sequence of bytes:

0A 82 45 8A 00

And let me know if you find them in the raw AdvancedSetup efi module?

[kasar]

yes that's correct kasar. It's actually all (29 02 0a 82 45 8a 00) to (01) in the last byte.

ah ok thx ^^

I asked because the other second hex string (00 20 00 29 02 0A 82 45 8A 00) unlocked the thermal menus for me.

I modified 3 strings in total

two 29 02 0a 82 45 8a 00 strings (one of them unlock language setting, and the other one unlock a bunch of menus)

and 00 20 00 29 02 0A 82 45 8A 00 (unlocked thermal menus)

[TimeWalker]

We are now tinkering to find additional stuff, mind taking a look at the Vostro 3450 thread in Phoenix subforum to read our rant?
Basically HairyCube stumbled upon another sequence which unlocks 2 more menus, however they don't seem to do what they are supposed to.. and also he got confused. So we need your guidance

[Florin9doi]

Can you check for this sequence of bytes:

0A 82 45 8A 00

And let me know if you find them in the raw AdvancedSetup efi module?

No. That doesn't exist