Before installing the Windows 10 Tech Preview, I created a recovery media on an USB stick, so that I could completely reset my Surface 3 and repave it with Windows 8.1, should I need to.
After the last update, my Windows 10 Tech Preview no longer connected to my wifi, so I decided to reset the PC. I expected that following these instructions would allow me to restore my Surface 3 to a working Windows 8.1 environment.
However, after step 9 (tapping Yes, repartition the drives) I get stuck with a message telling me to insert the Windows installation media. Cancel is the only available option at that point.