Hello, I recently got a new laptop and discovered that intel disabled undervolting due to the plundervolt exploit. I hope to enable undervolting again so i can have decent battery life. I attempted to do it myself with uefiextractor on the bios given by asus to get the bin file and uefi tool to find
where the overclocking lock is than I extracted it and parsed with ifrextractor and found the addresses in CpuSetup to change. After changing cfg lock overclocking lock and the overclocking performance menu XTU and throttlestop remained disabled.
Bios Dump IFRExtractor text file
*Edit fixed links, i wish i knew they were broken*
Thanks for reading, and I hope to achieve my goal!
@PentBeear
1. How do you change variables in offset?? By Grub or Ru.efi? Maybe something wrong?
2. On this
topic ,it's also a Asus 12th gen laptop ,it has the same offset of CFG Lock & Overclocking Lock as you machine ,member
cheukhin.tse change them by RU.efi ,maybe you could take a attempt via Ru.efi as well.
(07-26-2022, 06:53 PM)genius239 Wrote: [ -> ]@PentBeear
1. How do you change variables in offset?? By Grub or Ru.efi? Maybe something wrong?
2. On this topic ,it's also a Asus 12th gen laptop ,it has the same offset of CFG Lock & Overclocking Lock as you machine ,member cheukhin.tse change them by RU.efi ,maybe you could take a attempt via Ru.efi as well.
Actually upon dumping the bios again i found that the values are not actually set. Could there be protections in place?
Upon even more research i think intel bootguard is enabled
@PentBeear
1. You still didn't answer how did you changed bios value. By grub or Ru.efi?? Twaek bios settings by change variables via grub or Ru.efi will not react to setup module ,so the extracted ifr will no change.
2. Your first backup is very werid ,19mb(bios region is 16mb) and weird strcurtures ,it's not a normal bios dump. How do you dumped it?
3. On Asus Intel laptops ,Bios guard was enabled from 10th gen ,but it will not effect bios mod or limit you to change efi variables.
(07-27-2022, 07:27 PM)genius239 Wrote: [ -> ]@PentBeear
1. You still didn't answer how did you changed bios value. By grub or Ru.efi?? Twaek bios settings by change variables via grub or Ru.efi will not react to setup module ,so the extracted ifr will no change.
2. Your first backup is very werid ,19mb(bios region is 16mb) and weird strcurtures ,it's not a normal bios dump. How do you dumped it?
3. On Asus Intel laptops ,Bios guard was enabled from 10th gen ,but it will not effect bios mod or limit you to change efi variables.
Oops sorry about that, I edited my message and removed the parts you needed...
I redumped the bios directly instead of extracting from an asus recovery image.
I also used both grub and ru.efi to modify the bios but they didnt actually stick or work.
NEW BIOS DUMP:
bios dump
@PentBeear
1. You don't need to attach the bios dump now ,because the known problem is we can't reflash the modified bios via fpt in a Asus 12th gen laptop even if we have disabled some locks. (Current cases are GU603ZX & G733CX)
2. On
#7 , @cheukhin.tse mentioned he can undervolt via Xtu , so it mean disabled Cfg lock...etc via Ru.efi is valid. But Grub is not work in his laptop. Maybe you can ask him the details.
(07-28-2022, 10:04 AM)genius239 Wrote: [ -> ]@PentBeear
1. You don't need to attach the bios dump now ,because the known problem is we can't reflash the modified bios via fpt in a Asus 12th gen laptop even if we have disabled some locks. (Current cases are GU603ZX & G733CX)
2. On #7 , @cheukhin.tse mentioned he can undervolt via Xtu , so it mean disabled Cfg lock...etc via Ru.efi is valid. But Grub is not work in his laptop. Maybe you can ask him the details.
I get errors when trying to write the variables to disable cfg lock in ru.efi and grub
0x0000001a for ru.efi
I don't quite know which varstore i'm supposed to be changing here?
If met the write error under Grub & Ru.efi both ,it mean you can't do anything . If you want to modifiy this bios, spi programmer is the only way. Below is a similar error message with another similar model(GU603ZX).
https://ibb.co/mT6MCyN
(07-28-2022, 11:16 AM)genius239 Wrote: [ -> ]If met the write error under Grub & Ru.efi both ,it mean you can't do anything . If you want to modifiy this bios, spi programmer is the only way. Below is a similar error message with another similar model(GU603ZX).
https://ibb.co/mT6MCyN
im 90% sure that it should be working. All the ifr extracted files show that cfg lock and overclocking lock is in varstore 0x2 CpuSetup, and those values are set to 0 as they are writable in grub and ru.efi
1. I'm confused by you , below are you responded at #7 ,met error is you said. But now you say 90% sure.......??!!
PentBeear Wrote:I get errors when trying to write the variables to disable cfg lock in ru.efi and grub
0x0000001a for ru.efi
2. Offset with CFG Lock is 0x43 instead of 0x2 , writing 0x0 to 0x43 under CpuSetup(varid=0x2) table.