TeraByte Unlimited

Brian, You mean if each (both) win10 will boot up from the partition, pointed to it?
First win partition is named OS (2nd part.), and now the second win10 ("OS bu", in 3rd part.) is not visible ("hide" selected) for the 1st win10.

When booting each, the correct name is visible in win explorer, as a C drive (with correct name), and in disk management correct partition is active.

That fault or feature appeared right after I installed BIU.
Has been there since the first boot with BIU installed.

That's normal. It attempts to update the current boot item to help out any
kernel loaders but on many systems that variable is read-only.


"Warning: Unable to point UEFI to current boot item (1h 0h)"

I wonder whether it's a fault or feature?

OK.
So, everything seems to be in order. So far.