How to install Windows 11 on ThinkPad T420 laptop?

I understand you're interested in installing Windows 11 on ThinkPad T420 laptop, which is an older model.

Potential Issues & Considerations:

• Performance: The T420’s hardware may struggle with Windows 11's demands.
• Stability: Unsupported hardware can lead to crashes or bugs.
• Security & Updates: Bypassing requirements may disable some security features or prevent updates.
• Legal & Support: Unsupported installations are not officially supported by Microsoft or Lenovo.

Your ThinkPad T420 does not meet the official Windows 11 requirements, especially regarding CPU and TPM. Workarounds exist but are not supported and may cause instability. For a more reliable experience, consider sticking with Windows 10, which is supported until October 2025. If you still want to proceed with Windows 11:

• Create a bootable installer with bypass flags.
• Disable Secure Boot and TPM checks in BIOS if possible.
• Be prepared for driver issues and potential instability.

If you still want to install Windows 11 on ThinkPad laptop. Given the hardware limitations, I recommend installing Windows 10 T420 for stability and security, and consider upgrading your hardware if you need Windows 11 in the future.