Have 20 HP Prodesk 400 G6 here. All come with a 500 GB nvme SSD incl. a bloated HP Win 10 Pro. As usual I disabled TPM and secureboot, to install a clean Windows 10 PRO. It worked fine on the 1st one. It booted the preinstalled HP Win 10, which I deleted afterwards to install a clean Win 10 Pro. But all other HPs keep starting with a "Starting Factory Recovery..." They not even attempt to start the predefined HP Win setup. By deleting all partitions, installing a fresh Win 10, the Win 10 DOES install though. BUT if I dont press F9 for Bootmanager on reboot / start, to select UEFI Win 10, it will boot into Recovery again. Which only starts the "advanced trouble" Win 10 screen. Diskpart looks ok. I also cant set the (latest) BIOS to legacy Boot. It simply wont show up. No matter how much I google. The "best" answer I found so far was : "This is meant to happening, so you can only use the bloated HP image" (but even that one wont boot/install) Might there be a(nother) hidden Recovery info ? Why is it these devices keep starting Recovery, while BIOS and Boot.ini do show a UEFI Win 10...which starts flawless when hammering F9 Boot Menu on startup ? Ill install a "normal" 2.5" SSD on the weekend and see what happens.