Can I start without the CSM support?
Can I start without the CSM support?
You're trying to enable secure boot for Windows 11 updates but encountering issues when disabling CSM support, resulting in no boot device display. You also mentioned having a SATA SSD with Windows 10 installed, and you're considering a clean installation without a blank DVD or USB drive.
Welcome to the forums, newcomer!
I am fine to delete everything and reinstall Windows
If you're going to go ahead with reinstalling the OS, make sure your motherboard is on the latest BIOS version, following that, the BIOS is set to UEFI(CSM disabled), fTPM/TPM enabled and lastly Secure Boot enabled.
Speaking of motherboards, please list the specs to your build like so:
CPU:
CPU cooler:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
Monitor:
include the age of the PSU apart from it's make and model. BIOS version for your motherboard at this moment of time.
but I have no blank DVD or a USB stick
You will need to source a 16GB pen drive in order to create an installer for your OS. Having two at hand would be a good idea since upgrading to Windows 11 using the internal upgrade path in Windows 10 ends up being half baked, meaning you will have to reinstall Windows 11 after the upgrade is completed.
Without USB storage of at least 8GB it's not possible to perform a clean Windows installation. You should upgrade only from W10. Since you didn't install W10 in UEFI mode, you need to convert your disk to GPT first. Then disable CSM in the BIOS to enable UEFI, which will allow Secure Boot and a clean installation. Actually, W10 can also run with GPT and UEFI and Secure Boot.