Lenovo Thinkpad E480 Windows 11

hi tom1321​ you can try below

Reboot into BIOS / UEFI

• Enable “Security Chip” / TPM.
• Enable Secure Boot (if not already).
• Save changes, exit, and reboot.

Run TPM Check

• Run tpm.msc in Windows → check “Specification Version” → must read 2.0.

Run PC Health Check

• Use Microsoft’s PC Health Check app to re-evaluate compatibility after the above firmware changes.

If Health Check Still Fails

• Consider doing a clean install of Windows 11 (mount ISO, run setup) — but back up your data first.
• Use Microsoft’s Windows 11 Installation Assistant from the https://www.microsoft.com/en-us/software-download/windows11

Ask Lenovo Support

• Reach out to Lenovo: mention your exact model type (20KN/20KQ) and ask whether your serial number is a “TPM-disabled region” unit.
• Check Lenovo’s Windows 11 Upgrade Guide for business / enterprise customers.
• https://techtoday.lenovo.com/sites/default/files/2022-12/Windows%2011%20Upgrade%20Reference%20Guide.pdf?