André The core issue is that the BIOS has a built-in genuine signing key, which only allows systems, drivers, and hardware firmware with official Microsoft signatures to boot.
After modification, two conflict points arise:
① A flashed/residual AMI test key (Test PK) is used, which is not a factory genuine key, causing Secure Boot verification to fail.
② NVMe to PCIe external graphics cards and SATA hard drives, as third-party adapters without Microsoft security signatures, will be blocked from booting when Secure Boot is enabled.
Solution 1: Temporary Bypass
Enter BIOS → Security → Secure Boot, and directly set Secure Boot to Disabled. Disabling Secure Boot will allow normal system boot.
Disadvantage: Loss of Windows 11 Secure Boot protection. Suitable for scenarios involving long-term use of external graphics card adapters.
Solution 2:
Please repeatedly press the delete key as soon as you turn on the PC and go to the BIOS. Please send us a picture of the Main page, and we will check if you need to update the BIOS.
