I wanted to downgrade from W10 to 8.1. I downloaded the necessary recovery image from MS, but the Surface did not want to use it. Some clever guide recommended deleting the partition. Which, being stupid, I did. So now I have a recovery image that does not work and no Windows. I turned off secure boot to see if it changes anything with USB stick, but no. Now I am downloading W8.1 pro as an USB stick. Will this work? Are there any issues? If this fails I could try the same with W10, it was already activated, so it should activate again. Help me Thanks.