I have messed up big time. So, in order to get windows 11 update I needed to change to UEFI and enable secure boot to install. However upon researching I needed to change the format of my drives (if that is the correct term) to GPT from MBR which I did.

I kept getting the blue screen of death with different error codes so I went into safe mode and reverted the partitions into MBR and changed it back to CSM (legacy) and now it says “Reboot and select proper boot device or insert boot media in selected boot device and press a key." I can’t get into windows and am just stuck with the BIOs. I don’t know what to do and every solution on the web does not help. Is it reversible or fixable?

I apologize for the format and possibly but probably wrong terms I am just stressed out and will clarify anything that needs clarification. Thank you so much in advance.

Also I have two drives (ssd) and I did the aforementioned steps to both at the same time.