You must download an image as the recovery partition will not work for this. The easiest way is to download and install the official 8.1 recovery image for you device as these pre date the patch. Microsoft patched the golden keys exploit, but fortunately for Tegra devices this can be reversed. For UEFI booting it is recommended to install yahallo.

Due to its added complexity it is discussed at the end of this page. APX currently offers considerably better performance, but it has the disadvantage of always needing 'jump leads'. TrustZone is still active, but recent changes to the Linux kernel (~5.11) allowed this to be automatically avoided.Ĭonsequently, the Surface RT has two boot options: APX or UEFI. It can be applied with the help of golden keys.

Yahallo is a new Tegra exploit that effectively turns off secure boot permanently. Secure boot and memory TrustZone are still active.

It allows a self-signed Windows boot manager app to run and in turn an UEFI app such as GRUB 2. Golden keys has been available since late 2016. This removes all the restrictions of the UEFI firmware.

For Tegra 3 based devices there is the USB tethered Fusée Gelée exploit.

Thankfully we now have a number of workarounds available to us: There is no doubt that secure boot has been a major hurdle in putting Linux on Windows RT devices.

This page makes a distinction between the two machines as they boot Linux differently, so follow the instructions for your device. It is important you know your model so that you can use the correct Device Tree Blob (DTB). Many Surface 2 owners are unaware they have a Surface 2 because both machines are labelled with 'Surface/Windows RT' under the kickstand! If your device has a black rear then you have the Tegra 3 (T30) based Surface RT, but if it is silver grey then you have the Tegra 4 (T114) based Surface 2. The above media need to be adapted for Windows RT devices and this is described below. You may find community builds such as the Ubuntu MATE Raspberry Pi images.Īlthough it is technically possible to install the full Ubuntu Desktop via Ubuntu Server/netboot, it is highly recommended that you install one of the lighter desktops such as Lubuntu, Xubuntu or MATE. A general (and hugely over-detailed) installation guide for this can be found here. Much of the Raspberry Pi Ubuntu Server documentation applies to the Surface RT.įor 20.04 there is also still the netboot installer. The only official and supported Ubuntu armhf (32-bit) media are the images for the Raspberry Pi.

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