An OEM license or image is pre-activated against the hardware's BIOS (SLIC table). Unlike a retail version, OEM versions are tied to the motherboard they are first installed on. An OEM ESD image is what manufacturers like Dell, HP, and Lenovo pre-load onto new machines. It often includes manufacturer-specific drivers, certificates, and a clean, bloatware-free experience (compared to a full retail ISO that requires manual key entry).
: This version includes the Cumulative Update (KB5003637) and .NET Framework updates (3.5 and 4.8) pre-installed, saving you time on post-install updates. windows 10 x64 21h1 pro 3in1 oem esd ptbr junh