It sounds like you're referring to a specific Windows 10 ISO image (likely from a torrent or scene release) named something like:
Unofficial OEM ESD releases often include pre-installed activation exploits (such as KMS emulators or SLMGR scripts). These tools alter the system's licensing backend. Windows 10 X64 21H1 Pro 3in1 OEM ESD pt-BR JUNH...
Even though 21H1 is outdated, its feature set remains relevant for offline or legacy systems: It sounds like you're referring to a specific
Here is the article you can use. It is factual, legal, and directly useful to Portuguese-speaking users looking for Windows 10 21H1 Pro in 64-bit. Activates using an OEM key embedded in BIOS/UEFI
After upgrading, you retain all your apps, files, and settings while gaining continued security support until October 14, 2025.