Uefitool greyed out8/18/2023 You should reread the warnings I wrote above before doing this. Save it ( not over the top of your clean ROM!). Having done that, you can now repack the ROM using UEFITool (using Replace body.), and then This doesn't appear in the text section of the binary. I'm being a bit rash here and just hoping that With 0A 82 12 06 0E 0B 00 FF (suppress if: variable 0xB0E has value 0xFF00), then we can forceĪll of these previously-hidden menu items to be shown. ALL OF THEMīy replacing the byte sequence 0A 82 12 06 0E 0B 00 00 (suppress if: variable 0xB0E has value 0x0) We can fix that using a hex editor ) Hmm. So then the interesting menu items are hidden. In my case, I discovered that there's a check to see if the variable 0xB0E is set to 0x0, and if It's super helpful, because it also displays the hex representationĪlongside, as well as displaying the location in the binary where it was found. Shine some light on when this is the case, by showing you a textual representation of what the Internalįorms Representation tree looks like. This includes, thankfully, the options for resetting the system back into Secure Boot Setup Mode.Ī tool called Universal IFR Extractor can help As a brief overview, this binary contains the setup menus, and often containsĪ bunch of functionality that's been masked out by the OEM, but which is still compiled in to the binary. Having found this binary, you can then dump it to a separate file (using Extract body. Way to find this for me was to just search for anything containing the Unicode string "Key Management"(!) the thing with all the settings which most people think of when you say "BIOS"). Once you've done that, you need to locate the UEFI binary which is the configuration utility Which supports repacking the ROM with changes. If you're following along, then as of writing, you That you've dump and make modifications to it. Well, using UEFITool it's possible to unpack the ROM image OK, great, you have a dump of your system's firmware (excluding the Management Engine's firmware). You never know when you might need it(!). Not published any firmware updates for this system yet, so we can't just download it.īACK THIS FILE UP. Using AMI's AFUWIN tool (download), it's possible toĭump (hint: the Save button is your friend!) the BIOS included with the system, since Razer have Measurements and cause unsealing to fail (by design!). Replacing your system's firmware *will* change the TPM To have your Bitlocker recovery key first. WARNING: if you do this, you probably want to not have Bitlocker enabled first, or at the very least WARNING WARNING: This will almost certainly void your warranty. Modifying the firmware, or "this way leads to insanity and a voided warranty" WARNING WARNING WARNING: There's a great potential to make your shiny new ultrabook into a £999+ brick. Using KeyTool.efi, I quickly discovered that the PK shipped with my system was the AMI.The Razer Blade Stealth uses AptioV from AMIĪs its firmware, which is fairly well understood. Note that I went back and took this picture afterwards, which is why this is already in User mode and the Vendor Keys are not active.īut that's OK. If they would even oblige, or just tell me to disable Secure Boot. I'm too lazy to contact Razer support to get a modified firmware, and I don't know Razer have hidden the option to get to the key management options on the Razer Blade Stealth,įor some reason. However: Secure Boot on the Razer Blade Stealth is. Modifying my laptop's firmware to allow me to substitute my own PKI for the factory shipped one. I'm not going to go into the details of the PKI used for Secure Boot, but more. My end goal here is to use my own PKI to sign binaries which I deem acceptable to run on my system. I wanted to see how much I could lock the platformĭown in terms of security, so, first steps. Where it's not quite enough to just have Android )Īnyway, it's dual-booting Arch and Windows 10. Generally just for those annoying edgecases Recently as an ultrabook I can take to lectures and just generally use when I'm out and aboutĪs a companion to the Pixel C I'm already using.
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