HP 15-Cd059sa (2YK85EA#ABU) My hard drive failed so upgraded with a 240GB SSD. I installed Windows 10 1709 with a USB stick made with HP Cloud Recovery. Once installed the laptop did a few updates including a BIOS update which went fine. The laptop did not offer Windows 10 20H2 so I ran the update manually which worked. After a few restarts to install updates, it restarted for the last time and did a HP BIOS update as before but instead of rebooting into Windows, it rebooted into a DOS like environment to updates other parts of the BIOS, ending with the boot block.