> For the complete documentation index, see [llms.txt](https://open-rt.gitbook.io/open-surfacert/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://open-rt.gitbook.io/open-surfacert/common/boot-sequence/special-boot-modes.md).

# Special Boot modes

## UEFI Boot from USB

1. Prepare USB: format it as FAT32 and copy your files
2. Insert USB into your Surface
3. Hold `Vol-Down`
4. Press `PWR`
5. Wait until the Surface logo shows and wait some more seconds
6. Release `Vol-Down`

{% hint style="info" %}
To boot unsigned non Microsoft UEFI Apps you need to apply [Yahallo](/open-surfacert/common/boot-sequence/uefi/secure-boot/disable-secureboot.md) first
{% endhint %}

## APX - tegra recovery mode

1. Connect your Tegra3/4 via an USB A-to-A cable to an USB 3.0 Port of your PC
2. Hold `Vol-Up`
3. Press `PWR`
4. Release `Vol-Up` it should immediately boot into APX mode
5. Use your payload sender to send data ([Fusée Gelée](/open-surfacert/common/boot-sequence/tegra-soc-boot-process/fusee-gelee.md))

{% hint style="info" %}
Newer PCs can use an USB Type C cable instead of USB A-to-A cable
{% endhint %}