When prompted, as you see on that screen, press the Windows Key to get to the
UEFI and change the boot order to USB on top (drag it to the top of the list).
Go to https://support.microsoft.com/en-us/surfacerecoveryimage (with a different Windows computer) and download a recovery image for your
Surface. You will need a 16GB USB stick formatted FAT32 (use a Windows
computer). Use FULL format and not quick format and give the volume a name like
surfboot.. There are full instructions and a video at
https://support.microsoft.com/en-us/help/4023512/surface-creating-and-using-a-usb-recovery-drive#download
but below are quick instructions). Unzip/extract the recovery zip to the formatted USB stick and then-
To reset your Surface from a USB recovery drive:
Step 1: Make sure your Surface is turned off and plugged in (hold down the power
button for 30 seconds).
Step 2: Insert the USB recovery drive into the USB port on your Surface.
Step 3: Press and hold the volume-down button while you press and release the
power button on your Surface.
Step 4: When the Surface logo appears, release the volume button.
Step 5: When prompted, select the language and keyboard layout you want.
Step 6: Select Troubleshoot > Reset your PC.
If prompted for a recovery key, select Skip this drive at the bottom of the
screen.
Step 7: Select the target operating system you wish to reset. This
refers to the current operating system installed on your Surface.
Step 8: Select Yes, repartition the drives, and on the next page, select Next.
Step 9: Choose Just remove my files.
Step 10: Select Reset.
Surface restarts and the Surface logo displays while the reset process continues
(this can take a while).