Windows 10: can resolve bootrec /fixboot

I've tried the official guides on how to curb the boot problem that you see black screen and only the mouse pointer that maps and loads ... When I get to do bootrec /fixboot it tells me access engaged, so I started looking for how to solve this problem, I tried all the guides but it does not unlock I have a uncommon computer, because I have 4 tb of space divided into several disks where on these disks I have luckily other windows installations so when I tried a guide to solve "fixboot" tells me that it could not understand where to apply the changes ... If you have guides even using one of

:)

 

Bootrec /fixboot → "Element not found"

As posted above (images inline, this time):

List volume




List disk




Select disk 1
List partition

 

Access denied on bootrec /fixboot

These are the commands and how to run them. No reason you should get Access denied.
Fix the MBR – Guide for Windows 10, 11, XP, Vista, 7, 8

 

Bootrec /fixboot Access is denied error

I encountered winlog.exe missing/corrupted issue during laptop startup. Have googled up solutions in repairing with USB bootable drive but did not help.

There's other recommendations to enter command prompt and enter the few bootrec commands. However upon entering Bootrec /fixboot....it stated access is denied.

Additionally there were additionals steps to follow but i still couldn't get this Bootrec /fixboot command accessible.

Anyone know why and what are other steps?