Feature update to Windows 10, version 1709 fails to install

1. if you mean i do

BCDEdit -enum {FWBootMGR}

and i can see parameter is incorrect at the bottom. YES its still there.

2. link of BCD backup

https://www.dropbox.com/sh/icvd0vh302kpmy7/AABrSqjw8ClgpmZ1MAFCpelHa?dl=0

It isn't really that hard to do. I suggest (as I think Robert implied) first try should really be BootRec. It isn't as drastic. But that must be done in the Recovery Environment (the BCD won't delete while booted to Windows) where you refuse to go. However, you can get there an easier way. Shift+Restart will go to the one that is on the SSD. But that probably/possibly becomes impossible, if somehow the BCD is destroyed. That is why really you need still to be able to get to the Recovery Environment of external media.

If you upload your "C:\BU\BCD Backup", I'll be able to fiddle with it. Does it still say "the parameter is incorrect" when listed?

i am just in awe on what i have read. None of which makes senses to me. (lol)

@ PCR

I have actually been wondering about using  bootrec  /rebuildbcd  instead but the difference between the two methods is clear as mud.  If anything it looks like bcdboot is a deployment tool and bootrec is a repair tool?

Good grief.  Here's another one

https://www.easeus.com/partition-manager-software/fix-uefi-boot-in-windows-10-8-7.html

(Google search for

    "bootrec /rebuildbcd" vs bcdboot  (in Windows 10)

)

Please note that ,I am not a technician or Engineer in the line. I am a common man and I have not much knowledge to do the things .If I do ,my position will worst.

@ PCR

I have actually been wondering about using  bootrec  /rebuildbcd  instead but the difference between the two methods is clear as mud.  If anything it looks like bcdboot is a deployment tool and bootrec is a repair tool?

Good grief.  Here's another one

https://www.easeus.com/partition-manager-software/fix-uefi-boot-in-windows-10-8-7.html

(Google search for

    "bootrec /rebuildbcd" vs bcdboot  (in Windows 10)

)