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

To boot unsigned non Microsoft UEFI Apps you need to apply Yahallo first

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)

Newer PCs can use an USB Type C cable instead of USB A-to-A cable