My Dell PC with Windows 10 Pro fails to boot, USB recovery bad.

I have the following problems:

1 Incremental Macrium backup to thumb drive stopped working after 5/9/23.
2 Two other full backups continued to run daily until:
3 Computer boot failed about a week later on 5/15/23, I think during restart of a Windows 10 pro automatic update.
4 My recovery USB thumb media (file dates 12/22/2023) starts but the SSD containing Windows is hidden.

I have 3 full backup images of the hidden drive. On a thumb drive, on a separate HDD in the computer, and on my Netgear R7000 router's Readyshare SSD.

I discussed this information in a thread I initiated on the Macrium Reflect community forum: My Dell PC with Windows 10 Pro fails to boot
But so far, no solution.

My failed desktop computer is a Dell Precision T1700 with Windows 10 Pro.
I am currently using my HP Spectre laptop running Windows 10 home.

does it show in my boot media?

1904v3.iso

The 500 GB SSD drive containing Windows does not show with the Macrium recovery media. Another 2TB WD HDD does show.

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I think I have two problems:

1 Boot failure.

2 I am aware now that I needed to make new recovery media following the May 9 update to Windows. I think this applies to both Windows and Macrium ISB recovery sticks. I didn't get the message!

Also, I don't understand about the 1904v3.iso.

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I tried to upload a jpg screen shot into a post and got this message:

"Sorry, you have been blocked
You are unable to access tenforums.com"