I have a SP3 with the primary partition as Win10. Everything is actually fine but I have to repurpose the device for someone else. I originally tried doing the native "reset" which reset it fine, but reset to Win10 (I didn't realize that upgrading to the tech preview changed the stock recovery partition). I then went here: https://www.microsoft.com/surface/e...ervice-and-recovery/downloadablerecoveryimage and downloaded the .zip. Next I took a flash drive, formatted it to FAT32 and unzipped the files from the zip to the flash drive. Basically the root of the drive includes the list of language sub folders and the bootmgr files. I loaded the recovery console boot menu and went to "reset" and "partition" and when it says insert a flash drive, I insert it but then it says the media inserted is not valid. What next?