Showing posts from 2021

Windows 10 legacy BIOS boot change UEFI - without OS reinstall

     If you are, like me, using Win10 with legacy BOOT option and would like to start playing with newest Windows 11 version - first problem probably will be TPM (Trusted Platform Module) chip... which can be easily added to VM - if it runs UEFI based boot firmware. Change, without proper existing disk preparation, could went wrong in terms of non-bootable machine etc. Summary - it can be done without OS reinstall and here are proposed steps that worked for me: - of course - some kind of backup/snapshot should be there, just in case ;) - run command " Get-Disk"  which should give you output that  Partition style is MBR ; - before actual conversion you can run validation with command " MBR2GPT.exe /validate /allowFullOS " - using variable " allowFullOS " inside running VM; - after successful validation - actual conversion is done by using command " MBR2GPT.exe /convert /allowFullOS "; - shut down VM after conversion is done and change to UEFI boot