I just received an HP 15-r132wm laptop that was originally installed with Windows 8.1 but now has 10. We don't have the user PIN, and I'm not interested in any of the data on this machine. I thought this would be simple! I tried to do a reset from the recovery partition, but it won't accept either Windows 10 or 8.1 from a USB flash drive. I also tried creating a bootable USB and dropping the 8.1 ISO files onto it so I can boot from it, and it does the same thing when I try to do a reset. Diskpart says there are 6 partitions, TWO of them recovery partitions for some reason. I would just settle for blowing everything away and installing from scratch, but I have to admit I'm not well versed on UEFI installs and I'm not clear as to whether the license key is in the UEFI, and whether I will have to install 8.1 and upgrade to 10 again. Suggestions?