Recovery mode asks for updates for a startup disk and then it just disappears from boot options

[docsportellochrys]

I am using MacBookPro 4-Thunderbolt 2020 on Intel.
I followed the guide to step 7 when this issue emerged.
After choosing the EFI Boot option in recovery mode it says that chosen startup disk must be updated. At first i said ok, let's run and update, and got launched in macos but the error persisted.
I also changed the conversion parameter of dd command to sync instead of fdatasync (as fdatasync didnt work). could this be causing issue?

[AdityaGarg8]

I am using MacBookPro 4-Thunderbolt 2020 on Intel. I followed the guide to step 7 when this issue emerged. After choosing the EFI Boot option in recovery mode it says that chosen startup disk must be updated. At first i said ok, let's run and update, and got launched in macos but the error persisted. I also changed the conversion parameter of dd command to sync instead of fdatasync (as fdatasync didnt work). could this be causing issue?

Did you turn off secure boot