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=== Firmware compatibility ===
Legacy [[BIOS]] is no longer officially supported; a [[UEFI]] system and a [[Trusted Platform Module]] (TPM) 2.0 security coprocessor is now officially required.<ref name=":1" /><ref name=":2" /><ref>{{Cite web |last=Thurrott |first=Paul |date=June 24, 2021 |title=Microsoft Unveils Windows 11 |url=https://www.thurrott.com/windows/windows-11/252299/microsoft-unveils-windows-11 |url-status=live |archive-url=https://web.archive.org/web/20210624205902/https://www.thurrott.com/windows/windows-11/252299/microsoft-unveils-windows-11 |archive-date=June 24, 2021 |access-date=June 24, 2021 |website=Thurrott.com}}</ref><ref>{{Cite news |last=Hanson |first=Matt |date=June 24, 2021 |title=Windows 11 system requirements are bad news for old laptops and PCs |work=[[TechRadar]] |url=https://www.techradar.com/uk/news/windows-11-system-requirements-are-bad-news-for-old-laptops-and-pcs |url-status=live |access-date=June 24, 2021 |archive-url=https://web.archive.org/web/20210625222754/https://www.techradar.com/uk/news/windows-11-system-requirements-are-bad-news-for-old-laptops-and-pcs |archive-date=June 25, 2021}}</ref> The TPM requirement in particular has led to confusion as many motherboards do not have TPM support, or require a compatible TPM to be physically installed onto the motherboard. Many newer CPUs also include a TPM implemented at the CPU level (with AMD referring to this as "fTPM", and Intel referring to it as "Platform Trust Technology" [PTT]),<ref>{{Cite web |last=Cunningham |first=Andrew |date=October 6, 2021 |title=How to upgrade to Windows 11, whether your PC is supported or not |url=https://arstechnica.com/gadgets/2021/10/how-to-upgrade-to-windows-11-whether-your-pc-is-supported-or-not/ |url-status=live |archive-url=https://web.archive.org/web/20211006184312/https://arstechnica.com/gadgets/2021/10/how-to-upgrade-to-windows-11-whether-your-pc-is-supported-or-not/ |archive-date=October 6, 2021 |access-date=October 6, 2021 |website=[[Ars Technica]]}}</ref> which might be disabled by default and require changing settings in the computer's UEFI firmware,<ref>{{Cite web |last=Burns |first=Chris |date=June 24, 2021 |title=Windows 11 update: TPM 2.0 and PC Health Check confusion |url=https://www.slashgear.com/windows-11-tpm-2-0-update-system-requirement-confusion-24679866/ |url-status=live |archive-url=https://web.archive.org/web/20210624203318/https://www.slashgear.com/windows-11-tpm-2-0-update-system-requirement-confusion-24679866/ |archive-date=June 24, 2021 |access-date=June 25, 2021 |website=SlashGear}}</ref> or a UEFI firmware update that changes the default settings to reflect these requirements.<ref>{{Cite web |last=Warren |first=Tom |date=August 5, 2021 |title=Asus releases Windows 11-ready BIOS updates with automatic TPM support |url=https://www.theverge.com/2021/8/5/22610869/asus-windows-11-bios-updates-download-tpm-support |url-status=live |archive-url=https://web.archive.org/web/20211006225532/https://www.theverge.com/2021/8/5/22610869/asus-windows-11-bios-updates-download-tpm-support |archive-date=October 6, 2021 |access-date=October 6, 2021 |website=[[The Verge]]}}</ref>
Starting with version 24H2, [[Windows IoT Enterprise|IoT Enterprise]] editions have officially reintroduced legacy BIOS support and eliminated the requirement for a TPM.<ref name=11_IoT_req/>
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