Getting ready for a new update on Windows 11 because of Secure Boot and a CSM issue in your BIOS settings.
Getting ready for a new update on Windows 11 because of Secure Boot and a CSM issue in your BIOS settings.
Hi, I am trying to update to Windows 11 for the first time. I have all the right hardware, like my B660M Pro RS motherboard and an Intel Core i5-12400F processor. I did enable Secure Boot in my BIOS, but when I turn CSM off, my old Windows 10 hard drive no longer shows up on my computer. (I originally turned on CSM from my BIOS so that I could boot with my regular Windows 10 drive without any trouble - it worked fine back then, but this blocks the Windows 11 upgrade). My storage is a Kingston SSD with 480GB and uses the NTFS file system. If buying a new SSD isn't an option because of its size, is there another way? I really need help, so please let me know what to do next. Thanks!
Sure, please share a picture of the Disk Management screen. You need to upload it here and give us the link. Moving from CSM back to UEFI needs you to split your drive's partitions and change them from MBR format to GPT format. To do this, use the mbr2gpt tool.
What is that 32GB drive? Is it a USB flash drive? It has an UEFI bootloader. Either take the drive out or delete the 99MB EFI system partition from it. These commands will remove the EFI system partition from your 32GB drive. diskpart list disk select disk 1 list partition select partition x (pick number two or three for the EFI system partition) delete partition override To turn your OS drive into a UEFI ready one, do this: Run a check from an elevated command prompt. Type mbr2gpt.exe /validate /disk:0 /allowFullOS If that works fine, then run the conversion. Type mbr2gpt.exe /validate /disk:0 /allowFullOS Then go into BIOS and turn off CSM, set the first boot device to Windows Boot Manager.
The 32 GB drive is just a regular data disk with some pictures on it. It's not really useful, but why bother? I disabled the MBR partition table in my BIOS settings right now. I'm watching the video for more tips and tricks. My C drive has been converted to an MBR format too. That feels strange because the computer used to start Windows from there before. I never thought much about it until now, so I just turned off that option at the boot-up menu. It probably won't hurt things in the near future, but yes, your advice sounds good. Do you think I should fix my MBR first? That's the most important step right now. Update:: Thanks a lot! I've already deleted everything because your instructions were so clear and helpful! (It must have been some leftover data from when I used that drive for Windows installation.)
First, delete the EFI system partition from your 32GB drive. Having more than one EFI system partition on the same computer makes things confusing. Also, make sure you have a Windows 10 or Windows 11 USB flash drive ready to use.
Okay - this time it worked. My computer is booting up normally in UEFI mode, not CSM or legacy anymore. The PC Health Check says everything looks fine and I can start Windows 11 right away. That is amazing! You have been such a huge help, and your clear instructions were very good (see the note above if you need to make an edit to /convert). Thank you so much, I really don't know how to say thank you enough. You are definitely a genius!